TYCO INTERNATIONAL LTD /BER/
S-4/A, 1999-02-23
GENERAL INDUSTRIAL MACHINERY & EQUIPMENT, NEC
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<PAGE>
   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 23, 1999
    
 
   
                                    REGISTRATION NOS. 333-71493 AND 333-71493-01
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                         ------------------------------
 
   
                                AMENDMENT NO. 1
                                       TO
                                    FORM S-4
    
 
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                         ------------------------------
 
                                      7382
 
                          (Primary Standard Industrial
                          Classification Code Number)
 
   
<TABLE>
<S>                                                             <C>
                   TYCO INTERNATIONAL LTD.                                      TYCO INTERNATIONAL GROUP S.A.
            (Exact name of registrant as specified                          (Exact name of registrant as specified
                       in its charter)                                                 in its charter)
 
                           BERMUDA                                                        LUXEMBOURG
                 (State or other jurisdiction                                    (State or other jurisdiction
              of incorporation or organization)                               of incorporation or organization)
 
                        NOT APPLICABLE                                                  NOT APPLICABLE
                        (IRS Employer                                                   (IRS Employer
                     Identification No.)                                             Identification No.)
 
                     THE GIBBONS BUILDING                                           6, AVENUE EMILE REUTER
                  10 QUEEN STREET, SUITE 301                                             SECOND FLOOR
                    HAMILTON HM11, BERMUDA                                            L-2420 LUXEMBOURG
                        (441) 292-8674                                                 (352) 46-43-40-1
(Address, including zip code, and telephone number, including   (Address, including zip code, and telephone number, including
    area code, of registrant principal executive offices)           area code, of registrant principal executive offices)
</TABLE>
    
 
                         ------------------------------
 
                                 MARK H. SWARTZ
                        C/O TYCO INTERNATIONAL (US) INC.
                                 ONE TYCO PARK
                          EXETER, NEW HAMPSHIRE 03833
                                 (603) 778-9700
           (Name, address, including zip code, and telephone number,
                   including area code, of agent for service)
                         ------------------------------
 
*   Tyco International Ltd. maintains its registered and principal executive
    offices at the Gibbons Building, 10 Queen Street, Suite 301, Hamilton HM 11
    Bermuda. The executive offices of Tyco's principal U.S. subsidiary, Tyco
    International (US) Inc., are located at One Tyco Park, Exeter, New Hampshire
    03833. The telephone number there is (603) 778-9700.
                         ------------------------------
 
                                    COPY TO:
 
                             JOSHUA M. BERMAN, ESQ.
                             ABBE L. DIENSTAG, ESQ.
                      KRAMER LEVIN NAFTALIS & FRANKEL LLP
                                919 THIRD AVENUE
                            NEW YORK, NEW YORK 10022
                                 (212) 715-9100
                         ------------------------------
 
   
    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after expiration of the exchange offer described herein.
    
 
    If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box. / /
 
    If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / / ______
 
    If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / / ______
                         ------------------------------
 
   
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
   
                 SUBJECT TO COMPLETION, DATED FEBRUARY 23, 1999
    
 
PROSPECTUS
 
   
                                  $800,000,000
                         TYCO INTERNATIONAL GROUP S.A.
                               OFFER TO EXCHANGE
                    UP TO $400,000,000 5.875% NOTES DUE 2004
               FOR ANY AND ALL OUTSTANDING 5.875% NOTES DUE 2004
                                      AND
                    UP TO $400,000,000 6.125% NOTES DUE 2008
               FOR ANY AND ALL OUTSTANDING 6.125% NOTES DUE 2008
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
    
 
                                     [LOGO]
 
                         Summary of the Exchange Offer
 
   
    This document and accompanying Letters of Transmittal relate to the proposed
offer by Tyco International Group S.A. (the "Company") to exchange up to
$400,000,000 aggregate principal amount of new 5.875% notes due 2004 for any and
all of its outstanding 5.875% notes due 2004 and up to $400,000,000 aggregate
principal amount of new 6.125% notes due 2008 for any and all of its outstanding
6.125% notes due 2008. The new notes of each series, which are referred to as
the "Exchange Notes," will be freely transferable. The outstanding notes of each
series, which are referred to as the "Restricted Notes," have certain transfer
restrictions.
    
 
    The Restricted Notes are, and the Exchange Notes will be, unsecured and
unsubordinated obligations of the Company that are fully and unconditionally
guaranteed on an unsecured and unsubordinated basis by Tyco International Ltd.
("Tyco"), the Company's corporate parent.
 
   
    - The exchange offer expires 5:00 p.m. New York City time on March   , 1999,
      unless extended.
    
 
   
    - All Restricted Notes that are tendered and not withdrawn will be exchanged
      promptly upon consummation of the exchange offer.
    
 
   
    - There should be no United States federal income tax consequences to
      holders of Restricted Notes who exchange Restricted Notes for Exchange
      Notes pursuant to the exchange offer.
    
 
   
    - Holders of Restricted Notes do not have any appraisal or dissenters'
      rights in connection with the exchange offer. Restricted Notes not
      exchanged in the exchange offer will remain outstanding and be entitled to
      the benefits of the indenture under which they were issued, but except
      under certain circumstances will not have further exchange or registration
      rights.
    
 
    - The Company does not intend to apply for listing of the Exchange Notes on
      any securities exchange or to arrange for them to be quoted on any
      quotation system.
 
   
    Each holder of Restricted Notes wishing to accept the exchange offer must
deliver the Restricted Notes to be exchanged, together with the appropriate
Letters of Transmittal that accompanies this document and any other required
documentation, to the exchange agent identified in this document. Alternatively,
you may effect a tender of Restricted Notes by book-entry transfer into the
exchange agent's account at the Depository Trust Company. All deliveries are at
the risk of the holder. You can find detailed instructions concerning delivery
in the "Exchange Offer" section of this document and in the accompanying Letters
of Transmittal.
    
 
                           --------------------------
 
   
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE EXCHANGE NOTES OR DETERMINED IF
THIS DOCUMENT IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
    
 
   
    YOU SHOULD READ THIS ENTIRE DOCUMENT AND ACCOMPANYING LETTERS OF TRANSMITTAL
AND RELATED DOCUMENTS AND ANY AMENDMENTS OR SUPPLEMENTS CAREFULLY BEFORE MAKING
YOUR DECISION TO PARTICIPATE IN THE EXCHANGE OFFER.
    
                           --------------------------
 
   
                The date of this prospectus is February   , 1999
    
<PAGE>
                      WHERE YOU CAN FIND MORE INFORMATION
 
   
    In connection with the exchange offer, the Company and Tyco have filed with
the Securities and Exchange Commission a registration statement under the
Securities Act of 1933, relating to the Exchange Notes. As permitted by SEC
rules, this document omits certain information included in the registration
statement. For a more complete understanding of the exchange offer, you should
refer to the registration statement, including its exhibits.
    
 
   
    Tyco also files annual, quarterly and current reports, proxy statements and
other information with the SEC. These filings are available to the public over
the Internet at the SEC's web site at http://www.sec.gov. You may also read and
copy any document filed by Tyco or the Company with the SEC at the SEC's public
reference rooms in Washington, D.C., New York, New York and Chicago, Illinois.
Please call the SEC at 1-800-SEC-0330 for further information on the public
reference rooms and their copy charges. Tyco's common shares are listed on the
New York Stock Exchange, as well as on the London and Bermuda Stock Exchanges.
You can obtain information about Tyco from the New York Stock Exchange at 20
Broad Street, New York, New York 10005.
    
 
   
    The SEC allows the Company and Tyco to "incorporate by reference"
information in documents filed with the SEC, which means that they can disclose
important information to you by referring you to those documents. These
incorporated documents contain important business and financial information
about the Company and Tyco that is not included in or delivered with this
document. The information incorporated by reference is considered to be part of
this document, and later information filed with the SEC may update and supersede
this information. The Company and Tyco incorporate by reference the documents
listed below and any future filings made with the SEC under Sections 13(a),
13(c), 14 or 15(d) of the Securities Exchange Act of 1934 prior to the
expiration of the exchange offer.
    
 
    1.  Tyco's Annual Report on Form 10-K and Form 10-K/A for the fiscal year
       ended September 30, 1998, except for Part II, Items 6, 7, 7A and 8.
 
   
    2.  Tyco's Quarterly Report on Form 10-Q for the fiscal quarter ended
       December 31, 1998.
    
 
   
    3.  Tyco's Current Reports on Form 8-K filed on December 10, 1998 and Form
       8-K/A filed on December 11, 1998.
    
 
    You may request a copy of these filings at no cost, by writing or calling
Tyco at the following address or telephone number:
 
       Tyco International Ltd.
       The Gibbons Building
       10 Queen Street
       Hamilton HM11, Bermuda
       (441) 292-8674
 
   
    Exhibits to the documents will not be sent, unless those exhibits have
specifically been incorporated by reference in this document.
    
 
   
    TO OBTAIN TIMELY DELIVERY OF ANY COPIES OF FILINGS REQUESTED, PLEASE WRITE
OR TELEPHONE NO LATER THAN MARCH   , 1999, TEN DAYS PRIOR TO THE EXPIRATION OF
THE EXCHANGE OFFER.
    
 
                                       i
<PAGE>
   
    YOU SHOULD RELY ONLY ON THE INFORMATION PROVIDED OR INCORPORATED BY
REFERENCE IN THIS DOCUMENT. NEITHER THE COMPANY NOR TYCO HAS AUTHORIZED ANYONE
ELSE TO PROVIDE YOU WITH DIFFERENT INFORMATION. YOU SHOULD NOT ASSUME THAT THE
INFORMATION IN THIS DOCUMENT IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE ON
THE FRONT OF THIS DOCUMENT. NEITHER THE DELIVERY OF THIS DOCUMENT OR AN
ACCOMPANYING LETTER OF TRANSMITTAL, NOR ANY EXCHANGE MADE PURSUANT TO THIS
DOCUMENT SHALL UNDER ANY CIRCUMSTANCES CREATE AN IMPLICATION THAT THE
INFORMATION CONTAINED IN THIS DOCUMENT IS CORRECT AS OF ANY SUBSEQUENT DATE.
    
 
   
    THE EXCHANGE OFFER IS NOT BEING MADE TO, NOR WILL TENDERS OF RESTRICTED
NOTES BE ACCEPTED FROM, HOLDERS OF RESTRICTED NOTES IN ANY JURISDICTION IN WHICH
THE EXCHANGE OFFER OR ITS ACCEPTANCE IS UNLAWFUL.
    
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
Where You Can Find More Information........................................................................           i
Forward Looking Information ...............................................................................           2
Tyco.......................................................................................................           3
The Company................................................................................................           3
Current Developments.......................................................................................           3
Ratio of Earnings to Fixed Charges of Tyco.................................................................           5
Exchange Offer.............................................................................................           6
Description of the Notes and the Guarantees................................................................          16
Enforcement of Civil Liabilities...........................................................................          32
United States Federal Income and Luxembourg Tax Consequences...............................................          33
Plan of Distribution.......................................................................................          36
Legal Matters..............................................................................................          36
Experts....................................................................................................          37
</TABLE>
    
 
                            ------------------------
 
                                       1
<PAGE>
   
                          FORWARD LOOKING INFORMATION
    
 
   
    Certain statements contained or incorporated by reference in this document
are "forward looking statements" within the meaning of the U.S. Private
Securities Litigation Reform Act of 1995. All forward looking statements involve
risks and uncertainties. In particular, any statement contained in this document
or any document incorporated by reference in this document regarding the
consummation and benefits of future acquisitions, as well as expectations with
respect to future sales, operating efficiencies and product expansion, are
subject to known and unknown risks, uncertainties and contingencies, many of
which are beyond the control of the Company and Tyco, which may cause actual
results, performance or achievements to differ materially from anticipated
results, performances or achievements. Factors that might affect such forward
looking statements include, among other things:
    
 
    - overall economic and business conditions;
 
   
    - the demand for the goods and services of the Company and Tyco;
    
 
    - competitive factors in the industries in which the Company and Tyco
      compete;
 
    - changes in government regulation;
 
   
    - changes in tax requirements, including tax rate changes, new tax laws and
      revised tax law interpretations;
    
 
   
    - interest rate fluctuations, foreign currency rate fluctuations and other
      capital market conditions;
    
 
    - economic and political conditions in international markets, including
      governmental changes and restrictions on the ability to transfer capital
      across borders;
 
    - the ability to achieve anticipated synergies and other costs savings in
      connection with acquisitions;
 
    - the timing, impact and other uncertainties of future acquisitions; and
 
   
    - the ability of the Company and Tyco and their customers and suppliers, to
      replace, modify or upgrade computer programs in order to adequately
      address the Year 2000 issue.
    
 
                                       2
<PAGE>
                                      TYCO
 
    Tyco is a diversified manufacturing and service company that, through its
subsidiaries:
 
    - designs, manufactures and distributes electrical and electronic components
      and designs, manufactures, installs and services undersea cable
      communication systems;
 
    - designs, manufactures and distributes disposable medical supplies and
      other specialty products, and conducts vehicle auctions and related
      services;
 
    - designs, manufactures, installs and services fire detection and
      suppression systems and installs, monitors and maintains electronic
      security systems; and
 
    - designs, manufactures and distributes flow control products.
 
    Tyco's strategy is to be the low-cost, high quality producer and provider in
each of its markets. It promotes its leadership position by investing in
existing businesses, developing new markets and acquiring complementary
businesses and products. Combining the strengths of its existing operations and
its business acquisitions, Tyco seeks to enhance shareholder value through
increased earnings per share and strong cash flows.
 
   
    Tyco's registered and principal executive offices are located at The Gibbons
Building, 10 Queen Street, Suite 301, Hamilton HM 11, Bermuda, and its telephone
number is (441) 292-8674. The executive offices of Tyco International (US) Inc.,
Tyco's principal United States subsidiary, are located at One Tyco Park, Exeter,
New Hampshire 03833, and its telephone number is (603) 778-9700.
    
 
                                  THE COMPANY
 
   
    Tyco International Group S.A., a Luxembourg company, is a wholly-owned
subsidiary of Tyco. The registered and principal offices of the Company are
located at 6, avenue Emile Reuter, 2nd Floor, L-2420 Luxembourg, and its
telephone number is (352) 46 43 40-1. Through its subsidiaries, the Company owns
substantially all of the assets, and engages in substantially all of the
businesses, owned or engaged in by Tyco.
    
 
                              CURRENT DEVELOPMENTS
 
   
PENDING ACQUISITION OF AMP
    
 
   
    On November 22, 1998, a subsidiary of Tyco entered into a definitive merger
agreement for the acquisition of AMP Incorporated. It is estimated that Tyco
will issue up to approximately 186.0 million common shares for delivery by its
subsidiary to the former shareholders of AMP in the merger. AMP designs,
manufactures and markets electronic, electrical and electro-optic connection
devices and associated application tools and machines. AMP had annual revenues
of approximately $5.5 billion in 1998. At December 31, 1998, AMP's total cash
and cash equivalents was approximately $261 million, its total debt was
approximately $702 million, including long-term debt of approximately $217
million, and its shareholders' equity was approximately $2.7 billion.
    
 
   
    In the transaction, AMP shareholders will receive a fraction of a Tyco
common share for each share of AMP common stock they own based upon an exchange
ratio which is designed to give AMP shareholders between $51.00 and $55.95 in
market value of Tyco common shares for each of their AMP shares. Under some
circumstances, the value could be below this range. The exchange ratio will be
determined based on an average stock price computed by taking the average of the
daily weighted averages of the trading price of Tyco common shares on the New
York Stock Exchange for the 15 trading days ending on March 26, 1999, which is
the fourth trading day prior to the date of the special meeting of AMP
shareholders to vote on the merger.
    
 
                                       3
<PAGE>
    Tyco has identified certain risks in connection with the AMP acquisition,
including:
 
   
    - The benefits to Tyco and its shareholders of the merger are predicated on
      the assumption that the merger will be accretive to Tyco's earnings per
      share, but this will only be the case if Tyco can efficiently integrate
      AMP with Tyco's existing operations. On a pro forma basis, which combines
      the financial results of the two companies based upon their historical
      performance, the merger is not accretive to earnings per share. Tyco
      expects that the merger will be accretive if it can realize cost savings
      and synergies through the combination of the two companies. In this
      regard, Tyco's management believes that it can continue to implement and
      enhance AMP's profit improvement plan, which involves staff reductions,
      plant closings and consolidations and other cost cutting activities. Tyco
      has in the past been successful in integrating prior acquisitions and
      realizing anticipated earnings benefits. However, with facilities in 53
      countries and approximately 48,500 employees worldwide, AMP is
      substantially larger than the largest company previously integrated by
      Tyco's management. It is possible that Tyco will not be able to integrate
      AMP in a manner that achieves the desired savings and other benefits.
      Also, it may take longer to achieve these savings and other benefits than
      anticipated by Tyco's management. If so, Tyco's earnings-per-share
      performance, which is driven in part by the success of its acquisitions,
      is likely to suffer.
    
 
   
    - The AMP acquisition could significantly increase the effects of the
      downturn in the Asian economy on Tyco. Historically, only 3% of Tyco's
      revenues were attributable to Tyco's Asian operations, as opposed to 20%
      of AMP's revenues. The effect of the downturn has been more pronounced on
      AMP because of AMP's greater dependence on Asian business. Tyco cannot
      predict how long the economic downturn in Asia will persist.
    
 
   
    The consummation of the AMP transaction is contingent upon approval by the
AMP shareholders of the merger, approval by the Tyco shareholders of the
issuance of the Tyco common shares to be delivered in connection with the merger
and other customary conditions. Special meetings of the shareholders of Tyco and
AMP to consider these matters have been scheduled for April 1, 1999. There is no
assurance that the AMP acquisition will be consummated.
    
 
   
    AMP is subject to the informational requirements of the Exchange Act, and in
accordance with the Exchange Act, files reports, proxy statements and other
information with the SEC. Tyco has filed a registration statement on Form S-4
with the SEC in respect of the AMP transaction, which has been declared
effective.
    
 
SALE OF $1.2 BILLION OF NOTES BY THE COMPANY
 
   
    On January 12, 1999, the Company consummated the public sale of $400 million
aggregate principal amount of its 6.125% notes due 2009 and $800 million
aggregate principal amount of its 6.875% notes due 2029.
    
 
                                       4
<PAGE>
                   RATIO OF EARNINGS TO FIXED CHARGES OF TYCO
 
   
    The following table sets forth the ratio of earnings to fixed charges of
Tyco for the three months ended December 31, 1998, the year ended September 30,
1998, the nine month transition period ended September 30, 1997 and the years
ended December 31, 1996, 1995 and 1994.
    
   
<TABLE>
<CAPTION>
                                               THREE MONTHS                          NINE MONTHS           YEAR ENDED
                                                   ENDED         YEAR ENDED             ENDED             DECEMBER 31,
                                               DECEMBER 31,     SEPTEMBER 30,       SEPTEMBER 30,     --------------------
                                                   1998            1998(3)             1997(3)          1996       1995
                                               -------------  -----------------  -------------------  ---------  ---------
<S>                                            <C>            <C>                <C>                  <C>        <C>
Ratio of earnings to fixed
  charges (1)(2).............................       1.34(4)            4.96                  (4)         1.29(4)      3.08
 
<CAPTION>
 
                                                 1994
                                               ---------
<S>                                            <C>
Ratio of earnings to fixed
  charges (1)(2).............................       3.21
</TABLE>
    
 
- ------------------------
 
(1) For purposes of determining the ratio of earnings to fixed charges, earnings
    consist of income (loss) before income taxes and extraordinary item, and
    fixed charges. Fixed charges consist of interest on indebtedness,
    amortization of debt expenses and one-third of rent expense which is deemed
    representative of an interest factor.
 
   
(2) On July 2, 1997, Tyco, formerly called ADT Limited, merged with Tyco
    International Ltd., a Massachusetts corporation ("Former Tyco"). On August
    27, 1997, Tyco consummated a merger with INBRAND Corporation, on August 29,
    1997, Tyco consummated a merger with Keystone International, Inc. and on
    October 1, 1998, Tyco consummated a merger with United States Surgical
    Corporation. Each of the four merger transactions qualifies for the pooling
    of interests method of accounting. As such, the ratios of earnings to fixed
    charges presented above include the effect of the mergers, except that the
    calculation presented above for periods prior to January 1, 1997 does not
    include INBRAND due to immateriality.
    
 
   
    Prior to their respective mergers, ADT, Keystone and US Surgical had
    December 31 year ends and Former Tyco had a June 30 fiscal year end. The
    historical results upon which the ratios are based have been combined using
    a December 31 year end for ADT, Keystone, Former Tyco and US Surgical for
    the year ended December 31, 1996. For 1995 and 1994, the ratio of earnings
    to fixed charges reflects the combination of ADT, Keystone and US Surgical
    with a December 31 year end and Former Tyco with a June 30 fiscal year end.
    
 
(3) In September 1997, Tyco changed its fiscal year end from December 31 to
    September 30. Accordingly, the nine-month transition period ended September
    30, 1997 and the year ended September 30, 1998 are presented.
 
(4) Earnings were insufficient to cover fixed charges by $489.6 million in the
    nine months ended September 30, 1997.
 
   
    Earnings for the three months ended December 31, 1998, the nine months ended
    September 30, 1997 and the year ended December 31, 1996 include merger,
    restructuring and other non-recurring charges of $434.9 million, $947.9
    million and $246.1 million, respectively. Earnings also include a charge for
    the impairment of long-lived assets of $76.0 million, $148.4 million and
    $744.7 million, respectively, in the three months ended December 31, 1998,
    the nine months ended September 30, 1997 and the year ended December 31,
    1996. The 1997 period also includes a write-off of purchased in-process
    research and development of $361.0 million.
    
 
   
    On a pro forma basis, the ratio of earnings to fixed charges excluding
    merger, restructuring and other non-recurring charges, charge for the
    impairment of long-lived assets and write-off of purchased in-process
    research and development would have been 5.46x, 5.71x and 4.82x for the
    three months ended December 31, 1998, the nine months ended September 30,
    1997 and the year ended December 31, 1996, respectively.
    
 
                                       5
<PAGE>
                                 EXCHANGE OFFER
 
REASON FOR THE EXCHANGE OFFER
 
   
    The Company initially sold the Restricted Notes in a private offering on
November 2, 1998 to Lehman Brothers Inc., J.P. Morgan Securities Inc., Credit
Suisse First Boston Corporation and Donaldson, Lufkin & Jenrette Securities
Corporation, collectively referred to as the "Initial Purchasers," pursuant to a
Purchase Agreement dated October 28, 1998 among the Company, Tyco as guarantor,
and the Initial Purchasers. The Initial Purchasers subsequently resold or were
permitted to resell the Restricted Notes:
    
 
   
    - to qualified institutional buyers in accordance with the provisions of
      Rule 144A under the Securities Act,
    
 
   
    - to institutional accredited investors in accordance with the provisions of
      Rule 501(a) under the Securities Act, and
    
 
   
    - outside the United States in accordance with the provisions of Regulation
      S under the Securities Act.
    
 
    In connection with the private offering of the Restricted Notes, the
Company, Tyco as guarantor, and the Initial Purchasers entered into a
Registration Rights Agreement dated October 28, 1998, in which the Company
agreed, among other things:
 
   
    - to file with the SEC on or before January 31, 1999, a registration
      statement relating to an exchange offer for the Restricted Notes;
    
 
   
    - use its reasonable best efforts to cause the exchange offer registration
      statement to be declared effective under the Securities Act on or before
      April 1, 1999;
    
 
   
    - upon the effectiveness of the exchange offer registration statement, to
      offer the holders of the Restricted Notes the opportunity to exchange
      their Restricted Notes in the exchange offer for a like principal amount
      of Exchange Notes;
    
 
   
    - to keep the exchange offer open for not less than 30 days, or longer, if
      required by applicable law, after notice of the exchange offer is mailed
      to holders of Restricted Notes; and
    
 
   
    - to use its reasonable best efforts to consummate the exchange offer on or
      before May 1, 1999.
    
 
    The Company also agreed, under certain circumstances:
 
   
    - to use its reasonable best efforts to file a shelf registration statement
      relating to the offer and sale of the Restricted Notes by the holders of
      the Restricted Notes;
    
 
   
    - to use its reasonable best efforts to cause such shelf registration
      statement to be declared effective; and
    
 
   
    - to use its reasonable best efforts to keep such shelf registration
      statement effective for two years after the shelf registration statement
      becomes effective or until the Restricted Notes covered by the shelf
      registration statement have been sold or cease to be outstanding.
    
 
   
    The exchange offer being made by this document is intended to satisfy the
Company's exchange and registration obligations under the Registration Rights
Agreement. If the Company fails to fulfill such obligations, holders of
outstanding Restricted Notes are entitled to receive additional interest at the
rate of 0.25% per annum for each violation of the obligations. The rate will
increase by an additional 0.25% each 90-day period during which the additional
interest continues to accrue. The maximum aggregate increase to the interest
rate under all circumstances is 1% per annum. After the Company has cured all
defaults of its registration and exchange obligations, the accrual of additional
    
 
                                       6
<PAGE>
interest on the Restricted Notes will cease, and the interest rate for each
series of Restricted Notes will revert to its original rate.
 
   
    For a more complete understanding of your exchange and registration rights,
please refer to the Registration Rights Agreement, which is included as Exhibit
4.5 to the registration statement relating to the Exchange Notes.
    
 
TRANSFERABILITY OF THE EXCHANGE NOTES
 
   
    Based on certain no-action letters issued by the staff of the SEC to others
in unrelated transactions, the Company believes that a noteholder may offer for
resale, resell or otherwise transfer any Exchange Notes without compliance with
the registration and prospectus delivery requirements of the Securities Act,
unless the noteholder
    
 
   
    - is acquiring the Exchange Notes other than in the ordinary course of
      business;
    
 
    - is participating, intends to participate or has an arrangement or
      understanding with any person to participate, in a distribution of the
      Exchange Notes;
 
   
    - is an "affiliate" of the Company, as defined in Rule 405 under the
      Securities Act; or
    
 
    - is an Initial Purchaser who acquired Restricted Notes directly from the
      Company in the initial offering to resell pursuant to Rule 144A,
      Regulation S or any other available exemption under the Securities Act.
 
   
    In any of the foregoing circumstances, a noteholder
    
 
    - will not be able to rely on the interpretations of the staff of the SEC,
      in connection with any offer for resale, resale or other transfer of
      Exchange Notes; and
 
    - must comply with the registration and prospectus delivery requirements of
      the Securities Act, or have an exemption available, in connection with any
      offer for resale, resale or other transfer of the Exchange Notes.
 
   
    The Company is not making this exchange offer to, nor will it accept
surrenders of Restricted Notes from, holders of Restricted Notes in any state in
which this exchange offer would not comply with the applicable securities laws
or "blue sky" laws of such state.
    
 
    Each broker-dealer that receives Exchange Notes for its own account in
exchange for Restricted Notes, where such Restricted Notes were acquired by such
broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such Exchange Notes. See "Plan of Distribution."
 
USE OF PROCEEDS
 
    Neither the Company nor Tyco will receive any cash proceeds from the
issuance of the Exchange Notes. As consideration for the Exchange Notes, the
Company will receive in exchange an equivalent principal amount of outstanding
Restricted Notes of the corresponding series, the terms of which are
substantially identical to the terms of the Exchange Notes, except that the
Exchange Notes will be freely transferable and issued free of any covenants
regarding exchange and registration rights.
 
   
    The Company will retire and cancel the Restricted Notes surrendered in
exchange for the Exchange Notes. Accordingly, the issuance of the Exchange Notes
under the exchange offer will not result in any change in the outstanding
aggregate indebtedness of the Company.
    
 
                                       7
<PAGE>
TERMS OF THE EXCHANGE OFFER
 
   
    The Restricted Notes were issued in two series, 5.875% notes due 2004 and
6.125% notes due 2008.
    
 
   
    As of the date of this document, $400 million aggregate principal amount of
the 5.875% notes and $400 million aggregate principal amount of the 6.125% notes
are outstanding. In the exchange offer, Restricted Notes of each series will be
exchanged for Exchange Notes of the corresponding series.
    
 
   
    Upon the terms and subject to the conditions set forth in this document and
in the accompanying Letters of Transmittal, the Company will accept all
Restricted Notes validly tendered and not withdrawn prior to 5:00 p.m. New York
City time on March   , 1999, the date that the exchange offer expires. This date
and time may be extended. See "Expiration Date; Extensions; Amendments" below.
After authentication of the Exchange Notes by the trustee under the indenture
governing the notes or an authenticating agent, the Company will issue and
deliver $1,000 principal amount of Exchange Notes in exchange for each $1,000
principal amount of outstanding Restricted Notes of the corresponding series
accepted in the exchange offer. Holders may tender some or all of their
Restricted Notes pursuant to the exchange offer in denominations of $1,000 and
integral multiples thereof.
    
 
    The form and terms of the Exchange Notes of each series are identical in all
material respects to the form and terms of the outstanding Restricted Notes of
the corresponding series, except that:
 
    - the offering of the Exchange Notes has been registered under the
      Securities Act;
 
    - the Exchange Notes will not be subject to transfer restrictions; and
 
    - the Exchange Notes will be issued free of any covenants regarding exchange
      and registration rights.
 
   
    The Exchange Notes will be issued under and entitled to the benefits of the
indenture that governs the Restricted Notes.
    
 
   
    In connection with the issuance of the Restricted Notes, the Company
arranged for the Restricted Notes to be issued and transferable in book-entry
form through the facilities of The Depository Trust Company, acting as a
depositary. The Exchange Notes will also be issuable and transferable in
book-entry form through DTC.
    
 
   
    This document, together with the accompanying Letters of Transmittal, is
initially being sent to all registered holders of Restricted Notes as of the
close of business on February   , 1999. The exchange offer for each series of
Restricted Notes is not conditioned upon any minimum aggregate principal amount
being tendered. However, the exchange offer is subject to certain customary
conditions which may be waived by the Company, and to the terms and provisions
of the Registration Rights Agreement. See "Conditions to the Exchange Offer"
below.
    
 
   
    The exchange agent is The Bank of New York, which also serves as trustee
under the indenture that governs the notes.
    
 
   
    The Company will be deemed to have accepted validly tendered Restricted
Notes when, as and if the Company has given oral or written notice thereof to
the exchange agent. The exchange agent will act as agent of the tendering
holders for the purpose of receiving Exchange Notes from the Company and as
agent of the Company for the purpose of delivering Exchange Notes to such
holders. See "Exchange Agent" below.
    
 
   
    If any tendered Restricted Notes are not accepted for exchange because of an
invalid tender or the occurrence of certain other events set forth herein,
certificates for any such unaccepted Restricted Notes will be returned, at the
Company's cost, to the tendering holder as promptly as practicable after the
expiration of the exchange offer.
    
 
                                       8
<PAGE>
   
    Holders who tender Restricted Notes in the exchange offer will not be
required to pay brokerage commissions or fees or, subject to the instructions in
the Letters of Transmittal, transfer taxes with respect to the exchange of
Restricted Notes pursuant to the exchange offer. The Company will pay all
charges and expenses, other than certain applicable taxes, in connection with
the exchange offer. See "Solicitation of Tenders, Fees and Expenses" below.
    
 
EXPIRATION DATE; EXTENSIONS; AMENDMENTS
 
   
    The exchange offer will expire at 5:00 p.m. New York City time on March   ,
1999, unless the Company, in its sole discretion, extends the exchange offer.
The Company may extend the exchange offer at any time and from time to time by
giving oral or written notice to the exchange agent and by timely public
announcement.
    
 
   
    The Company reserves the right, in its sole discretion, to amend the terms
of the exchange offer in any manner. If any of the conditions set forth below
under "Conditions to the Exchange Offer" has occurred and has not been waived by
the Company, the Company expressly reserves the right, in its sole discretion,
by giving oral or written notice to the exchange agent, to:
    
 
   
    - delay acceptance of, or refuse to accept, any Restricted Notes not
      previously accepted;
    
 
   
    - extend the exchange offer; or
    
 
   
    - terminate the exchange offer.
    
 
   
Any such delay in acceptance, extension, termination or amendment will be
followed as promptly as practicable by oral or written notice thereof by the
Company to the registered holders of the Restricted Notes. If the exchange offer
is amended in a manner determined by the Company to constitute a material
change, the Company will promptly disclose such amendment in a manner reasonably
calculated to inform the holders of such amendment, and the Company will extend
the exchange offer to the extent required by law. If the exchange offer is
terminated, federal law requires that the Company promptly either exchange or
return all Restricted Notes that have been tendered.
    
 
   
    The Company will have no obligation to publish, advise, or otherwise
communicate any delay in acceptance, extension, termination or amendment of the
exchange offer other than by making a timely press release. The Company may also
publicly communicate these matters in any other appropriate manner of its
choosing.
    
 
INTEREST ON THE EXCHANGE NOTES
 
   
    Interest on the Exchange Notes will accrue from the last interest payment
date on which interest was paid on the Restricted Notes surrendered in exchange
therefor or, if no interest has been paid on the Restricted Notes, from November
2, 1998. The Exchange Notes will bear interest at a rate of 5.875% or 6.125% per
annum, as applicable. Interest on the Exchange Notes will be payable
semi-annually on May 1 and November 1 of each year. Assuming that the exchange
offer is consummated prior to May 1, 1999, as anticipated, interest on the
Exchange Notes will first become payable beginning on May 1, 1999.
    
 
PROCEDURES FOR TENDERING
 
   
    Only a holder of record of Restricted Notes or a DTC participant listed on a
DTC securities position listing with respect to the Restricted Notes may tender
its Restricted Notes in the exchange offer. To tender Restricted Notes in the
exchange offer:
    
 
   
    - registered holders of certificated Restricted Notes must complete, sign
      and date the appropriate Letter of Transmittal, or a facsimile thereof, in
      accordance with the instructions contained in this
    
 
                                       9
<PAGE>
   
      document and in the Letter of Transmittal. EACH SERIES OF NOTES HAS ITS
      OWN LETTER OF TRANSMITTAL. The holder should then mail or otherwise
      deliver such Letter of Transmittal, or such facsimile, together with the
      Restricted Notes to be exchanged and any other required documentation, to
      the exchange agent, at the address set forth in this document and in the
      Letter of Transmittal.
    
 
   
    - holders of Restricted Notes that are DTC participants may follow the
      procedures for book-entry transfer as provided for below under "Book-Entry
      Transfer" and in the Letters of Transmittal.
    
 
   
To be effective, a tender must be made prior to the expiration of the exchange
offer.
    
 
   
    Any beneficial owner whose Restricted Notes are registered in the name of a
broker, dealer, commercial bank, trust company or other nominee and who wishes
to tender Restricted Notes in the exchange offer should contact such registered
holder promptly and instruct such registered holder to tender on such beneficial
owner's behalf. If a beneficial owner wishes to tender on its own behalf, such
beneficial owner must, prior to completing and executing the appropriate Letter
of Transmittal and delivering its Restricted Notes, either make appropriate
arrangements to register ownership of the Restricted Notes in its own name or
obtain a properly completed bond power from the registered holder of such
Restricted Notes. This transfer of record ownership may take considerable time.
    
 
   
    Delivery of documents to DTC in accordance with DTC's procedures will NOT
constitute delivery to the exchange agent.
    
 
   
    The tender by a holder of Restricted Notes will constitute an agreement
between such holder, the Company and the exchange agent in accordance with the
terms and subject to the conditions set forth herein and in the Letters of
Transmittal. If less than all the Restricted Notes held by a holder of
Restricted Notes are tendered, a tendering holder should fill in the amount of
Restricted Notes being tendered in the specified box on the appropriate Letter
of Transmittal. The entire amount of Restricted Notes delivered to the exchange
agent will be deemed to have been tendered unless otherwise indicated.
    
 
   
    The Letters of Transmittal will include representations by the tendering
holder to the Company that, among other things:
    
 
    - any Exchange Notes received by the tendering holder will be acquired in
      the ordinary course of its business;
 
    - the tendering holder has no arrangement or understanding with any person
      to participate in the distribution of the Exchange Notes; and
 
   
    - the tendering holder is not an "affiliate," as defined in Rule 405 under
      the Securities Act, of the Company, or, if it is an affiliate, that it
      will comply with the registration and prospectus delivery requirements of
      the Securities Act to the extent applicable.
    
 
   
    A Letter of Transmittal of a broker-dealer that receives Exchange Notes for
its own account in exchange for Restricted Notes that were acquired by it as a
result of market-making or other trading activities must also include an
acknowledgment that the broker-dealer will deliver a copy of this document in
connection with the resale of such Exchange Notes. By so acknowledging and by
delivering a prospectus, such broker-dealer will not be deemed to admit that it
is an "underwriter" within the meaning of the Securities Act. See "Plan of
Distribution."
    
 
   
    The method of delivery of Restricted Notes and Letters of Transmittal and
all other required documents or transmittal of an Agent's Message, as described
below under "Book-Entry Transfer," to the exchange agent is at the election and
risk of the holders of Restricted Notes. Instead of delivery by mail, it is
recommended that holders of Restricted Notes use an overnight or hand delivery
service. In all cases, sufficient time should be allowed to ensure delivery to
the exchange agent prior to the
    
 
                                       10
<PAGE>
   
expiration of the exchange offer. No Letters of Transmittal or Restricted Notes
should be sent to the Company.
    
 
   
    Signatures on a Letter of Transmittal or a notice of withdrawal described in
"Withdrawal of Tenders" below must be guaranteed by a member firm of a
registered national securities exchange or of the National Association of
Securities Dealers, Inc., a commercial bank or trust company having an office or
correspondent in the United States or an "eligible guarantor institution" within
the meaning of Rule 17Ad-15 under the Exchange Act (each, an "Eligible
Institution"), unless the corresponding Restricted Notes are tendered
    
 
   
    - by a registered holder who has not completed the box entitled "Special
      Registration Instructions" or the box entitled "Special Delivery
      Instructions" in the Letter of Transmittal; or
    
 
    - for the account of an Eligible Institution.
 
   
If a Letter of Transmittal is signed by a person other than the registered
holder, the corresponding Restricted Notes must be endorsed or accompanied by
appropriate bond powers which authorize such person to tender the Restricted
Notes on behalf of the registered holder, in either case signed as the name of
the registered holder or holders appears on the Restricted Notes. If a Letter of
Transmittal or any Restricted Notes or bond powers are signed or endorsed by
trustees, executors, administrators, guardians, attorneys-in-fact, officers or
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and unless waived by the Company,
submit evidence satisfactory to the Company of their authority to so act with
such Letter of Transmittal.
    
 
   
    All questions as to the validity, form, eligibility, acceptance and
withdrawal of the tendered Restricted Notes will be determined by the Company in
its sole discretion, which determination will be final and binding. The Company
reserves the absolute right to reject Restricted Notes not properly tendered or
any Restricted Notes the Company's acceptance of which would, in the opinion of
counsel for the Company, be unlawful. The Company also reserves the absolute
right to waive any irregularities or conditions of tender as to particular
Restricted Notes. The Company's interpretation of the terms and conditions of
the Exchange Offer, including the instructions in the Letters of Transmittal,
will be final and binding on all parties. Unless waived, any defects or
irregularities in connection with tenders of Restricted Notes must be cured
within such time as the Company shall determine.
    
 
   
    Although the Company intends to notify tendering holders of defects or
irregularities with respect to tenders of Restricted Notes, neither the Company,
the exchange agent nor any other person will be under any duty or obligation to
do so, and no person will incur any liability for failure to give such
notification. Restricted Notes will not be validly tendered until such
irregularities have been cured or waived. Any Restricted Notes received by the
exchange agent that the Company determines are not properly tendered or the
tender of which is otherwise rejected by the Company will be returned by the
exchange agent to the tendering holder or other person specified in the
appropriate Letter of Transmittal as soon as practicable following the
expiration of the exchange offer.
    
 
    The Company reserves the right in its sole discretion:
 
   
    - to purchase or make offers for any Restricted Notes that remain
      outstanding subsequent to the expiration of the exchange offer;
    
 
   
    - to terminate the exchange offer, as set forth in "Conditions to the
      Exchange Offer" below; and
    
 
   
    - to the extent permitted by applicable law, to purchase Restricted Notes
      during the pendency of the exchange offer in the open market, in privately
      negotiated transactions or otherwise.
    
 
   
The terms of any such purchases or offers may differ from the terms of the
exchange offer.
    
 
                                       11
<PAGE>
BOOK-ENTRY TRANSFER
 
   
    The Company understands that the exchange agent will make a request promptly
after the date of this document to establish accounts with respect to the
Restricted Notes at DTC for the purpose of facilitating the exchange offer. Any
financial institution that is a participant in DTC's system may make book-entry
delivery of Restricted Notes by causing DTC to transfer such Restricted Notes
into the Exchange Agent's DTC account in accordance with DTC's Automated Tender
Offer Program procedures for such transfer. The exchange for tendered Restricted
Notes will only be made after a timely confirmation of a book-entry transfer of
the Restricted Notes into the exchange agent's account, and timely receipt by
the exchange agent of an Agent's Message.
    
 
   
    The term "Agent's Message" means a message, transmitted by DTC and received
by the exchange agent and forming part of the confirmation of a book-entry
transfer, which states that DTC has received an express acknowledgment from a
participant tendering Restricted Notes and that such participant has received an
appropriate Letter of Transmittal and agrees to be bound by the terms of the
Letter of Transmittal, and the Company may enforce such agreement against the
participant. Delivery of an Agent's Message will also constitute an
acknowledgement from the tendering DTC participant that the representations
contained in the appropriate Letter of Transmittal and described on page 10
above are true and correct.
    
 
GUARANTEED DELIVERY PROCEDURES
 
   
    Holders who wish to tender their Restricted Notes and:
    
 
   
    - whose Restricted Notes are not immediately available,
    
 
   
    - who cannot deliver their Restricted Notes, the appropriate Letter of
      Transmittal or any other required documents to the exchange agent prior to
      the expiration of the exchange offer, or
    
 
   
    - who cannot complete the procedure for book-entry transfer on a timely
      basis,
    
 
may effect a tender if:
 
    - the tender is made through an Eligible Institution;
 
   
    - prior to the expiration of the exchange offer the exchange agent receives
      from such Eligible Institution a properly completed and duly executed
      Notice of Guaranteed Delivery by facsimile transmittal, mail or hand
      delivery; and
    
 
   
    - certificate(s) representing all tendered Restricted Notes in proper form
      for transfer, together with the properly completed and executed Letter(s)
      of Transmittal, or facsimile(s) thereof and all other documents required
      by the Letter(s) of Transmittal, or confirmation of a book-entry transfer
      into the exchange agent's account at DTC of Restricted Notes delivered
      electronically, are received by the exchange agent within three business
      days after the expiration of the exchange offer.
    
 
   
    A Notice of Guaranteed Delivery must state:
    
 
   
    - the name and address of the holder;
    
 
   
    - if the Restricted Notes will be tendered by their registered holder, the
      certificate number or numbers of such Restricted Notes;
    
 
   
    - the principal amount of such Restricted Notes tendered;
    
 
    - that the tender is being made thereby; and
 
   
    - that the holder guarantees that, within three business days after the
      expiration of the exchange offer, an appropriate Letter of Transmittal or
      facsimile thereof, together with the certificate(s) representing the
      Restricted Notes to be tendered in proper form for transfer and any other
    
 
                                       12
<PAGE>
   
      documents required by the Letter of Transmittal, or confirmation of a
      book-entry transfer into the exchange agent's account at DTC of Restricted
      Notes delivered electronically, will be deposited by the Eligible
      Institution with the exchange agent.
    
 
   
Forms of the Notice of Guaranteed Delivery will be available from the exchange
agent upon request.
    
 
WITHDRAWAL OF TENDERS
 
   
    Except as otherwise provided herein, tenders of Restricted Notes may be
withdrawn at any time prior to the expiration of the exchange offer by delivery
of a written or facsimile transmission notice of withdrawal to the exchange
agent at its address set forth in this document.
    
 
   
    Any such notice of withdrawal must:
    
 
   
    - specify the name of the person having deposited the Restricted Notes to be
      withdrawn;
    
 
   
    - identify the Restricted Notes to be withdrawn, including the certificate
      number or number and principal amount of such Restricted Notes or, in the
      case of Restricted Notes transferred by book-entry transfer, the name and
      number of the account at DTC to be credited;
    
 
   
    - be signed by the depositor of the Restricted Notes in the same manner as
      the original signature on the Letter of Transmittal by which such
      Restricted Notes were tendered, including any required signature
      guarantee, or be accompanied by documents of transfer sufficient to permit
      the registrar to register the transfer of such Restricted Notes into the
      name of the party withdrawing the tender; and
    
 
   
    - specify the name in which any such Restricted Notes are to be registered,
      if different from that of the depositor of the Restricted Notes.
    
 
   
    All questions as to the validity, form and eligibility of such withdrawal
notices will be determined by the Company, whose determination shall be final
and binding on all parties. Any Restricted Notes so withdrawn will be deemed not
to have been validly tendered for purposes of the exchange offer, and no
Exchange Notes will be issued with respect thereto unless the Restricted Notes
so withdrawn are validly retendered. Any Restricted Notes that have been
tendered but are not accepted for exchange will be returned to the holder
thereof without cost to such holder as soon as practicable after withdrawal,
rejection of tender or termination of the exchange offer. Properly withdrawn
Restricted Notes may be retendered by following one of the procedures described
above under "Procedures for Tendering" at any time prior to the expiration of
the exchange offer.
    
 
CONDITIONS TO THE EXCHANGE OFFER
 
   
    The Company will not be required to accept for exchange, or to exchange
notes for, any Restricted Notes, and may terminate or amend the exchange offer
before the acceptance of such Restricted Notes if, in the Company's judgment,
any of the following conditions has occurred:
    
 
   
    - the exchange offer, or the making of any exchange by a holder of
      Restricted Notes, violates applicable law or the applicable
      interpretations of the SEC staff;
    
 
   
    - any action or proceeding shall have been instituted or threatened in any
      court or by or before any governmental agency or body with respect to the
      exchange offer; or
    
 
   
    - there has been adopted or enacted any law, statute, rule or regulation
      that can reasonably be expected to impair the ability of the Company to
      proceed with the exchange offer.
    
 
   
    See "Expiration Date; Extensions; Amendments" above for a discussion of
possible Company actions if any of the foregoing conditions occur.
    
 
   
    The foregoing conditions are for the sole benefit of the Company. They may
be asserted by the Company regardless of the circumstances giving rise to any
such condition or may be waived by the
    
 
                                       13
<PAGE>
Company in whole or in part at any time and from time to time in its sole
discretion. The failure by the Company at any time to exercise any of the
foregoing rights will not be deemed a waiver of any such right, and each such
right will be deemed an ongoing right which may be asserted at any time and from
time to time.
 
EXCHANGE AGENT
 
   
    The Bank of New York has been appointed as exchange agent for the exchange
offer. Requests for assistance and requests for additional copies of this
document or of the Letters of Transmittal should be directed to the exchange
agent addressed as follows:
    
 
    BY MAIL, OVERNIGHT DELIVERY OR HAND DELIVERY:
    The Bank of New York
    101 Barclay Street, 7E
    New York, New York 10286
    Attn: Denise Robinson
 
    FACSIMILE TRANSMISSION:
    (212) 815-4699
 
   
    INFORMATION OR CONFIRMATION BY TELEPHONE:
    (212) 815-2791
    
 
SOLICITATION OF TENDERS; FEES AND EXPENSES
 
   
    The principal solicitation pursuant to the exchange offer is being made by
the Company by mail and through the facilities of DTC. Additional solicitations
may be made by officers and regular employees of the Company and its affiliates
in person or by telegraph, telephone, facsimile transmission, electronic
communication or similar methods.
    
 
   
    The Company has not retained any dealer-manager in connection with the
exchange offer and will not make any payments to brokers, dealers or other
persons soliciting acceptances of the exchange offer. The Company will, however,
pay the exchange agent reasonable and customary fees for its services and will
reimburse the exchange agent for its reasonable out-of-pocket costs and expenses
incurred in connection with the exchange offer and will indemnify the exchange
agent for all losses and claims incurred by it as a result of the exchange
offer. The Company may also pay brokerage houses and other custodians, nominees
and fiduciaries the reasonable out-of-pocket expenses incurred by them in
forwarding copies of this document, the Letters of Transmittal and related
documents to the beneficial owners of the Restricted Notes and in handling or
forwarding tenders for exchange.
    
 
   
    The Company will pay all expenses incurred in connection with the exchange
offer, including fees and expenses of the trustee, accounting and legal fees,
including the expense of one counsel to the Initial Purchasers, and printing
costs.
    
 
   
    The Company will pay any transfer taxes applicable to the exchange of
Restricted Notes pursuant to the exchange offer. If, however, a transfer tax is
imposed for any reason other than the exchange of Restricted Notes pursuant to
the exchange offer, then the amount of any such transfer taxes, whether imposed
on the registered holder thereof or any other person, will be payable by the
tendering holder.
    
 
ACCOUNTING TREATMENT
 
    The Exchange Notes will be recorded at the same carrying value as the
Restricted Notes, as reflected in the Company's accounting records on the date
of the exchange. Accordingly, no gain or loss for accounting purposes will be
recognized by the Company as a result of the consummation of the
 
                                       14
<PAGE>
   
exchange offer. The expense of the exchange offer will be amortized by the
Company over the term of the Exchange Notes.
    
 
CONSEQUENCES OF A FAILURE TO EXCHANGE RESTRICTED NOTES
 
   
    Following consummation of the exchange offer, assuming the Company has
accepted for exchange all validly tendered Restricted Notes, the Company will
have fulfilled its exchange and registration obligations under the Registration
Rights Agreement. All untendered Restricted Notes outstanding after consummation
of the exchange offer will continue to be valid and enforceable debt obligations
of the Company, fully and unconditionally guaranteed by Tyco, subject to the
restrictions on transfer set forth in the indenture governing the notes. Holders
of such Restricted Notes will only be able to offer for sale, sell or otherwise
transfer untendered Restricted Notes as follows:
    
 
   
    - to the Company, although the Company has no obligation to purchase
      untendered Restricted Notes except if they are called for redemption in
      accordance with the provisions of the indenture governing the notes;
    
 
   
    - pursuant to a registration statement that has been declared effective
      under the Securities Act, although the Company will have no obligation,
      and does not intend, to file any such registration statement;
    
 
   
    - for so long as the Restricted Notes are eligible for resale pursuant to
      Rule 144A under the Securities Act, to a person reasonably believed to be
      a qualified institutional buyer, or QIB, within the meaning of Rule 144A,
      that purchases for its own account or for the account of a QIB to whom
      notice is given that the transfer is being made in reliance on the
      exemption from the registration requirements of the Securities Act
      provided by Rule 144A;
    
 
    - pursuant to offers and sales that occur outside the United States to
      foreign persons in transactions complying with the provisions of
      Regulation S under the Securities Act;
 
   
    - to an institutional "accredited investor" within the meaning of Rule
      501(a)(1), (2), (3) or (7) under the Securities Act purchasing for its own
      account or for the account of an institutional accredited investor; or
    
 
    - pursuant to any other available exemption from the registration
      requirements of the Securities Act.
 
   
    To the extent that Restricted Notes are tendered and accepted in the
exchange offer, the liquidity of the trading market for untendered Restricted
Notes could be adversely affected.
    
 
ABSENCE OF A PUBLIC MARKET
 
   
    Although holders of Exchange Notes who are not "affiliates" of the Company
within the meaning of the Securities Act may resell or otherwise transfer their
Exchange Notes without compliance with the registration requirements of the
Securities Act, there is no existing market for the Exchange Notes, and there
can be no assurance as to the liquidity of any markets that may develop for the
Exchange Notes, the ability of holders of Exchange Notes to sell their Exchange
Notes or the prices at which holders would be able to sell their Exchange Notes.
Future trading prices of the Exchange Notes will depend on many factors,
including, among other things, prevailing interest rates, Tyco's operating
results and the market for similar securities.
    
 
   
    The Initial Purchasers in the private offering have advised the Company that
they intend to make a market in the Exchange Notes after the exchange offer.
However, they are not obligated to do so, and any market-making may be
discontinued at any time without notice.
    
 
                                       15
<PAGE>
                  DESCRIPTION OF THE NOTES AND THE GUARANTEES
 
   
    Each of the Restricted Notes and their related guarantees were issued and
the Exchange Notes and their related guarantees will be issued under an
Indenture, dated as of June 9, 1998, as supplemented, in the case of the 5.875%
Notes due 2004, by Supplemental Indenture No. 5, and, in the case of the 6.125%
Notes due 2008, by Supplemental Indenture No. 6, each dated as of November 2,
1998, in each case among the Company, Tyco and The Bank of New York, as the
trustee. The following description is subject to the detailed provisions of the
Indenture, a copy of which can be obtained upon request from Tyco. See "Where
You Can Find More Information." As used in this "Description of the Notes and
the Guarantees," "2004 notes" refers to the series of both the Restricted Notes
and the Exchange Notes with the interest rate of 5.875% per annum and a maturity
in 2004, and the term "2008 notes" refers to the series of both the Restricted
Notes and the Exchange Notes with the interest rate of 6.125% per annum and a
maturity in 2008. The terms of the Restricted Notes and the Exchange Notes of
the corresponding series are identical, except that the Exchange Notes are not
subject to restrictions on transfer. The term "notes" refers to and includes the
Restricted Notes and the Exchange Notes of both series. The Indenture is subject
to, and governed by, the Trust Indenture Act of 1939, as amended. The statements
made in this section relating to the Indenture and to the notes and guarantees
of the notes to be issued under the Indenture are summaries, and do not purport
to be complete. For a full description of the terms of the notes and their
guarantees, noteholders should refer to the Indenture, as supplemented by the
Supplemental Indentures. Capitalized terms used but not defined herein shall
have the respective meanings set forth in the Indenture.
    
 
GENERAL
 
   
    Each of the 2004 notes and the 2008 notes are separate series of notes under
the Indenture. The interest rate, aggregate principal amounts and maturity dates
of each series of notes are as follows:
    
 
<TABLE>
<CAPTION>
                                                        2004 NOTES            2008 NOTES
                                                   --------------------  --------------------
<S>                                                <C>                   <C>
Interest Rate....................................         5.875%                6.125%
Aggregate Principal Amount.......................      $400 million          $400 million
Maturity Date....................................    November 1, 2004      November 1, 2008
</TABLE>
 
   
    Interest is payable semiannually on May 1 and November 1 of each year,
commencing May 1, 1999, to the persons in whose names such notes are registered
at the close of business on April 15 or October 15, respectively, immediately
preceding such interest payment date. Interest on the notes accrues from
November 2, 1998.
    
 
   
    The trustee is initially acting as paying agent and registrar, as well as
exchange agent under the exchange offer. The notes of each series may be
presented for registration or transfer and exchange, without any service charge,
at the offices of the registrar. Principal and premium, if any, on each series
of notes are payable at the office of the trustee. However, note holders may be
required to pay to the Company a sum sufficient to cover any tax or other
governmental charge payable in connection with any such transfer or exchange.
    
 
   
    The notes are direct, unsecured and unsubordinated obligations of the
Company and rank equally with other unsecured and unsubordinated obligations of
the Company for money borrowed. The notes are effectively subordinated to all
existing and future indebtedness and other liabilities of the Company's
subsidiaries. The Company's rights and the rights of its creditors, including
holders of notes, to participate in any distribution of assets of any subsidiary
upon the latter's liquidation or reorganization or otherwise will be effectively
subordinated to the claims of the subsidiary's creditors, except to the extent
that the Company or any of its creditors may itself be a creditor of that
subsidiary.
    
 
   
    Except as described under "Certain Covenants," the Indenture does not limit
other indebtedness or securities which may be incurred or issued by the Company
or any of its subsidiaries or contain financial or similar restrictions on the
Company or any of its subsidiaries. There are no covenants or
    
 
                                       16
<PAGE>
   
provisions contained in the Indenture which afford the holders of notes
protection in the event of a highly leveraged transaction, reorganization,
restructuring, merger or similar transaction involving the Company. The
consummation of any highly leveraged transaction, reorganization, restructuring,
merger or similar transaction could cause a material decline in the credit
quality of the outstanding notes.
    
 
    The Restricted Notes were, and the Exchange Notes will be, initially issued
in the form of one or more registered global notes and will be deposited with,
or on behalf of, The Depository Trust Company, as depositary, and registered in
the name of DTC's nominee. A description of DTC's procedures with respect to the
global notes is set forth under "Book-Entry, Delivery and Form" below.
 
   
    The Indenture does not limit the aggregate principal amount of debt
securities which may be issued thereunder. As of the date of this document,
$3.95 billion of debt securities in eight series have been issued by the Company
and guaranteed by Tyco and are outstanding under the Indenture. The interest
rate, aggregate principal amounts and maturity dates of each of such series of
debt securities, other than the Restricted Notes, are as follows:
    
 
<TABLE>
<CAPTION>
                                                                                                          DEALER
                                                                                                       REMARKETABLE
                                                                                                     SECURITIES (SM)
                         2001 NOTES    2005 NOTES     2009 NOTES      2028 NOTES     2029 NOTES       ("DRS.(SM)")*
                        ------------  ------------  ---------------  ------------  ---------------  ------------------
<S>                     <C>           <C>           <C>              <C>           <C>              <C>
Interest Rate.........       6%            6%           6.125%            7%           6.875%             6 1/4%
Aggregate Principal
  Amount..............  $750 million  $750 million   $400 million    $500 million   $800 million       $750 million
                          June 15,      June 15,      January 15,      June 15,      January 15,
Maturity Date.........      2001          2005           2005            2028           2029          June 15, 2013
</TABLE>
 
- ------------------------
 
*   Dealer remarketable securities(SM)" and ("Drs.(SM)") are service marks of
    J.P. Morgan Securities Inc.
 
GUARANTEES
 
   
    Tyco unconditionally guarantees the due and punctual payment of the
principal of, premium, if any, and interest and any Additional Amounts, as
defined below under "Payment of Additional Amounts", if any, on the notes of
each series when and as the same shall become due and payable, whether at
maturity, upon redemption or otherwise. Tyco's guarantees of the notes are
unsecured and unsubordinated obligations of Tyco and will rank equally with all
other unsecured and unsubordinated obligations of Tyco. The guarantees provide
that in the event of a default in payment of principal of, premium, if any, or
interest on a note, the holder of the note may institute legal proceedings
directly against Tyco to enforce the guarantees without first proceeding against
the Company. In addition, as described below under "Certain
Covenants--Limitation on Indebtedness of Subsidiaries," subsidiaries of the
Company may execute and deliver additional guarantees.
    
 
   
    The obligations of Tyco and any other guarantor of the notes, if any, under
their guarantees are limited to the maximum amount which will not result in the
obligations of such guarantors under their guarantees constituting a fraudulent
conveyance or fraudulent transfer under applicable law. Each guarantor of the
notes that makes a payment or distribution under its guarantee shall be entitled
to a contribution from each other guarantor of the notes to the extent permitted
by applicable law.
    
 
REDEMPTION
 
OPTIONAL REDEMPTION
 
   
    The notes are redeemable, in whole or in part, at the option of the Company
at any time at a redemption price equal to the greater of
    
 
        1. 100% of their principal amount, and
 
   
        2. the sum of the present values of the remaining scheduled payments of
    principal and interest that the Company has not yet made on the notes, not
    including any portion of such payments of interest accrued as of the date of
    redemption, discounted to the redemption date on a semiannual basis,
    assuming a 360-day year consisting of twelve 30-day months, at the Adjusted
    Redemption
    
 
                                       17
<PAGE>
   
    Treasury Rate, as defined below, plus 15 basis points in the case of the
    2004 notes or 25 basis points in the case of the 2008 notes plus, in each
    case, accrued interest to the date of redemption.
    
 
   
The Company must provide the holders of notes to be redeemed with a notice of
redemption at least 30 and not more than 60 days before the redemption date. See
"Notice of Redemption" below.
    
 
    "Adjusted Redemption Treasury Rate" means, with respect to any redemption
date, the annual rate equal to the semiannual equivalent yield to maturity or
interpolated, on a 30/360 day count basis, yield to maturity of the Comparable
Redemption Treasury Issue, assuming a price for the Comparable Redemption
Treasury Issue, expressed as a percentage of its principal amount, equal to the
Comparable Redemption Treasury Price for such redemption date.
 
   
    "Comparable Redemption Treasury Issue" means, with respect to each note to
be redeemed, the United States Treasury security selected by the Quotation Agent
as having a maturity comparable to the remaining term of such note to be
redeemed that would be utilized at the time of selection and in accordance with
customary financial practice, in pricing new issues of corporate debt securities
of comparable maturity to the remaining term of such note.
    
 
    "Comparable Redemption Treasury Price" means, with respect to any redemption
date:
 
    - the average of the Redemption Reference Treasury Dealer Quotations, for
      such redemption date, after excluding the highest and lowest such
      Redemption Reference Treasury Dealer Quotations, unless there is more than
      one highest or lowest quotation, in which case only one such highest
      and/or lowest quotation shall be excluded, or
 
    - if the Quotation Agent obtains fewer than four such Redemption Reference
      Treasury Dealer Quotations, the average of all such Redemption Reference
      Treasury Dealer Quotations.
 
    "Quotation Agent" means a Redemption Reference Treasury Dealer appointed as
such agent by the Company.
 
   
    "Redemption Reference Treasury Dealer" means such of Lehman Brothers Inc.
and four other primary U.S. Government securities dealers in New York City
selected by the Company.
    
 
   
    "Redemption Reference Treasury Dealer Quotations" means, with respect to
each Redemption Reference Treasury Dealer and any redemption date, the offer
price for the Comparable Redemption Treasury Issue, expressed in each case as a
percentage of its principal amount, for settlement on the redemption date quoted
in writing to the Quotation Agent by such Redemption Reference Treasury Dealer
at 5:00 p.m. New York City time on the third business day preceding such
redemption date.
    
 
REDEMPTION UPON CHANGES IN WITHHOLDING TAXES
 
   
    The Company may redeem all, but not less than all, of the notes of any
series if the following occurs:
    
 
   
        1. After the date that the notes to be redeemed were issued, there is a
    change in the laws or regulations of Luxembourg or any of its political
    subdivisions or taxing authorities, or any change in the application or
    official interpretation of such laws or regulations.
    
 
   
        2. As a result of this change, the Company became or will become
    obligated to pay Additional Amounts, as defined below under "Payment of
    Additional Amounts", on the next payment date with respect to the notes to
    be redeemed.
    
 
        3. The obligation to pay Additional Amounts cannot be avoided through
    the Company's reasonable measures.
 
   
        4. The Company delivers to the trustee:
    
 
   
    - a certificate signed by two directors of the Company stating that the
      obligation to pay Additional Amounts cannot be avoided by the Company
      taking reasonable measures available to it; and
    
 
                                       18
<PAGE>
    - a written opinion of independent legal counsel to the Company of
      recognized standing to the effect that the Company has or will become
      obligated to pay Additional Amounts as a result of a change, amendment,
      official interpretation or application described above and that the
      Company cannot avoid the payment of such Additional Amounts by taking
      reasonable measures available to it.
 
        5. Following the delivery of the certificate and opinion described in
    paragraph 4 above, the Company provides notice of redemption not less than
    30 days, but not more than 60 days, prior to the date of redemption. The
    notice of redemption cannot be given more than 60 days before the earliest
    date on which the Company would be otherwise required to pay Additional
    Amounts, and the obligation to pay Additional Amounts must still be in
    effect when the notice is given.
 
   
    Upon the occurrence of all of 1 through 5 above, the Company may redeem the
notes at a redemption price equal to 100% of the principal amount thereof,
together with accrued interest, if any, to the redemption date, plus any
Additional Amounts.
    
 
NOTICE OF REDEMPTION
 
   
    The following notice provisions apply to both the optional redemptions of
notes and redemptions of notes upon changes in Luxembourg withholding taxes
described above.
    
 
   
    The Company must deliver by first-class mail, postage prepaid, to the
holders of notes to be redeemed, a notice of redemption specifying the
following:
    
 
   
    - the redemption price,
    
 
   
    - the amount of the notes held by the holder to be redeemed,
    
 
   
    - the redemption date,
    
 
   
    - the place of payment,
    
 
   
    - that payment will be made when the notes of such series are surrendered to
      the trustee,
    
 
   
    - that interest accrued to the date of redemption will be paid as specified
      in the notice, and
    
 
   
    - that after the redemption date, and unless the Company defaults in the
      payment of the redemption price, interest will stop accruing on the notes
      to be redeemed.
    
 
   
At least one business day prior to the redemption date specified in the notice
of redemption, the Company will deposit with the trustee or with one or more
paying agents an amount of money sufficient to redeem on the redemption date all
the notes called for redemption. If less than all the notes of a series are to
be redeemed, the trustee will select, in such manner as it deems appropriate and
fair, notes of such series to be redeemed. Unless the Company defaults on the
redemption payments, on and after the redemption date specified in the notice of
redemption:
    
 
   
    - interest on the notes called for redemption will cease to accrue, and
    
 
   
    - the holders of such notes will have no right in respect of such notes
      except the right to receive the redemption price thereof and unpaid
      interest to the date fixed for redemption.
    
 
PAYMENT OF ADDITIONAL AMOUNTS
 
   
    Unless otherwise required by Luxembourg law, neither the Company nor Tyco
will deduct or withhold from payments made with respect to the notes and the
guarantees on account of any present or future taxes, duties, levies, imposts,
assessments or governmental charges of whatever nature imposed or levied by or
on behalf of any Luxembourg taxing authority ("Taxes"). In the event that the
Company or Tyco is required to withhold or deduct on account of any Taxes from
any payment made under or with respect to any notes or the guarantees, the
Company or Tyco, as the case may be, will pay such additional amounts so that
the net amount received by each holder of notes, including the additional
amounts, will equal the amount that such holder would have received if such
Taxes had not
    
 
                                       19
<PAGE>
   
been required to be withheld or deducted. The amounts that the Company or Tyco
are required to pay to preserve the net amount receivable by holders of notes
are referred to as "Additional Amounts."
    
 
   
    Additional Amounts will not be payable with respect to a payment made to a
holder of notes to the extent:
    
 
   
        1. that any such Taxes would not have been so imposed but for the
    existence of any present or former connection between such holder and the
    Luxembourg taxing authority imposing such Taxes, other than the mere receipt
    of such payment, acquisition, ownership or disposition of such notes or the
    exercise or enforcement of rights under such notes, the guarantees of the
    notes or the Indenture;
    
 
   
        2. of any estate, inheritance, gift, sales, transfer, or personal
    property Taxes imposed with respect to such notes, except as otherwise
    provided in the Indenture;
    
 
   
        3. that any such Taxes would not have been imposed but for the
    presentation of such notes, where presentation is required, for payment on a
    date more than 30 days after the date on which such payment became due and
    payable or the date on which payment thereof is duly provided for, whichever
    is later, except to the extent that the beneficiary or holder thereof would
    have been entitled to Additional Amounts had the notes been presented for
    payment on any date during such 30-day period; or
    
 
   
        4. that such holder would not be liable or subject to such withholding
    or deduction of Taxes but for the failure to make a valid declaration of
    non-residence or other similar claim for exemption, if (x) the making of
    such declaration or claim is required or imposed by statute, treaty,
    regulation, ruling or administrative practice of the relevant Luxembourg
    taxing authority as a precondition to an exemption from, or reduction in,
    the relevant Taxes, and (y) at least 60 days prior to the first payment date
    with respect to which the Company or Tyco shall apply this clause 4, the
    Company or Tyco has notified all holders of notes in writing that they are
    required to provide such declaration or claim.
    
 
    The Company and Tyco, as applicable, will also:
 
   
    - withhold or deduct Taxes as required,
    
 
   
    - remit the full amount of Taxes deducted or withheld to the relevant
      Luxembourg taxing authority in accordance with all applicable laws,
    
 
   
    - use its reasonable best efforts to obtain from each Luxembourg taxing
      authority imposing such Taxes certified copies of tax receipts evidencing
      the payment of any Taxes deducted or withheld, and
    
 
   
    - upon request, make available to the holders of the notes, within 60 days
      after the date the payment of any Taxes deducted or withheld is due
      pursuant to applicable law, certified copies of tax receipts evidencing
      such payment by the Company or Tyco or if, notwithstanding the Company's
      or Tyco's efforts to obtain such receipts, the same are not obtainable,
      other evidence of such payments by the Company or Tyco.
    
 
   
    At least 30 days prior to each date on which any payment under or with
respect to a series of notes is due and payable, if the Company or Tyco will be
obligated to pay Additional Amounts with respect to such payment, the Company or
Tyco will deliver to the trustee an officer's certificate stating the fact that
such Additional Amounts will be payable, the amounts so payable and such other
information as is necessary to enable the trustee to pay such Additional Amounts
to holders of such notes on the payment date.
    
 
   
    The foregoing provisions shall survive any termination of the discharge of
the Indenture and shall apply MUTATIS MUTANDIS to any jurisdiction in which any
successor to the Company or Tyco, as the case may be, is organized or is engaged
in business for tax purposes or any political subdivisions or taxing authority
or agency thereof or therein.
    
 
                                       20
<PAGE>
    In addition, the Company will pay any stamp, issue, registration,
documentary or other similar taxes and duties, including interest, penalties and
Additional Amounts with respect thereto, payable in Luxembourg or the United
States or any political subdivision or taxing authority of or in the foregoing
in respect of the creation, issue, offering, enforcement, redemption or
retirement of any of the Notes.
 
   
    Whenever in the Indenture, the notes, the guarantees of the notes and in
this "Description of the Notes and the Guarantees" there is mentioned, in any
context, the payment of principal, and premium, if any, redemption price,
interest or any other amount payable under or with respect to any note, such
mention shall be deemed to include mention of the payment of Additional Amounts
to the extent payable in the particular context.
    
 
BOOK-ENTRY, DELIVERY AND FORM
 
THE GLOBAL NOTES
 
   
    The certificates representing the Restricted Notes were issued, and the
certificates representing the Exchange Notes will be issued, in fully registered
form, without coupons. The Restricted Notes are represented by one or more
permanent global certificates in definitive, fully registered form without
interest coupons. Except as described under "Certificated Exchange Notes," the
Exchange Notes initially will be represented by one or more permanent global
certificates in definitive, fully registered form and
    
 
   
    - will be deposited with, or on behalf of, DTC, and registered in the name
      of Cede & Co., as DTC's nominee, or
    
 
   
    - will remain in the custody of the trustee pursuant to a FAST Balance
      Certificate Agreement between DTC and the trustee.
    
 
CERTAIN BOOK-ENTRY PROCEDURES FOR THE GLOBAL NOTES
 
    The descriptions of the operations and procedures of DTC, Euroclear and
Cedel set forth below are provided solely as a matter of convenience. These
operations and procedures are solely within the control of the respective
settlement systems and are subject to change by them from time to time. The
Company takes no responsibility for these operations or procedures, and
investors are urged to contact the relevant system or its participants directly
to discuss these matters.
 
    DTC has advised the Company that it is:
 
    - a limited purpose trust company organized under the laws of the State of
      New York,
 
    - a "banking organization" within the meaning of the New York Banking Law,
 
    - a member of the Federal Reserve System,
 
    - a "clearing corporation" within the meaning of the Uniform Commercial
      Code, as amended, and
 
    - a "clearing agency" registered pursuant to Section 17A of the Exchange
      Act.
 
   
DTC was created to hold securities for its participants and facilitates the
clearance and settlement of securities transactions between its participants
through electronic book-entry changes to the accounts of its participants,
thereby eliminating the need for physical transfer and delivery of certificates.
DTC's participants include securities brokers and dealers, which may include the
Initial Purchasers, banks and trust companies, clearing corporations and certain
other organizations. Access to DTC's system is also available to indirect
participants such as banks, brokers, dealers and trust companies that clear
through or maintain a custodial relationship with a participant, either directly
or indirectly. Investors who are not participants may beneficially own
securities held by or on behalf of DTC only through DTC participants or indirect
participants.
    
 
    The Company expects that pursuant to procedures established by DTC:
 
   
        1. upon the deposit of the global notes representing the Exchange Notes,
    DTC will credit the accounts of its participants with an interest in the
    global notes and
    
 
                                       21
<PAGE>
   
        2. ownership of the Exchange Notes will be shown on, and the transfer of
    ownership thereof will be effected only through, records maintained by DTC,
    with respect to the interests of its participants, and the records of DTC's
    participants and indirect participants, with respect to the interests of
    persons other than participants.
    
 
   
    The laws of some jurisdictions may require that certain purchasers of
securities take physical delivery of such securities in definitive form.
Accordingly, the ability to transfer interests in the Exchange Notes represented
by global notes to such persons may be limited. In addition, because DTC can act
only on behalf of its participants, who in turn act on behalf of persons who
hold interests through a DTC participant, the ability of a person having an
interest in Exchange Notes represented by a global note to pledge or transfer
such interest to persons or entities that do not participate in DTC's system, or
to otherwise take actions in respect of such interest, may be affected by the
lack of a physical definitive security in respect of such interest.
    
 
   
    So long as DTC or its nominee is the registered owner of a global note, DTC
or such nominee, as the case may be, will be considered the sole owner or holder
of the Exchange Notes represented by the global note for all purposes under the
Indenture. Except as provided below, owners of beneficial interests in a global
note will not be entitled to have Exchange Notes represented by such global note
registered in their names, will not receive or be entitled to receive physical
delivery of certificated Exchange Notes, and will not be considered the owners
or holders thereof under the Indenture for any purpose, including with respect
to the giving of any direction, instruction or approval to the trustee under the
Indenture. Accordingly, each holder owning a beneficial interest in a global
note must rely on the procedures of DTC and, if such holder is not a DTC
participant or an indirect participant, on the procedures of the participant
through which such holder owns its interest, to exercise any rights of a holder
of Exchange Notes under the Indenture or such global note. The Company
understands that under existing industry practice, in the event that the Company
requests any action of holders of Exchange Notes, or a holder that is an owner
of a beneficial interest in a global note desires to take any action that DTC,
as the holder of such global note, is entitled to take, DTC would authorize its
participants to take such action and the participants would authorize holders
owning through participants to take such action or would otherwise act upon the
instruction of such holders. Neither the Company nor the trustee will have any
responsibility or liability for any aspect of the records relating to or
payments made on account of Exchange Notes by DTC, or for maintaining,
supervising or reviewing any records of DTC relating to such Exchange Notes.
    
 
   
    Payments with respect to the principal of, and premium, if any, and interest
on, any Exchange Notes represented by a global note registered in the name of
DTC or its nominee on the applicable record date will be payable by the trustee
to or at the direction of DTC or its nominee in its capacity as the registered
holder of the global note representing such Exchange Notes under the Indenture.
Under the terms of the Indenture, the Company and the trustee may treat the
persons in whose names the Exchange Notes, including the global notes, are
registered as the owners thereof for the purpose of receiving payment thereon
and for any and all other purposes whatsoever. Accordingly, neither the Company
nor the trustee has or will have any responsibility or liability for the payment
of such amounts to owners of beneficial interests in a global note, including
principal, premium, if any, and interest. Payments by the DTC participants and
indirect participants to the owners of beneficial interests in a global note
will be governed by standing instructions and customary industry practice and
will be the responsibility of the participants or the indirect participants and
DTC.
    
 
   
    Transfers between participants in DTC will be effected in accordance with
DTC's procedures, and will be settled in same-day funds. Transfers between
participants in Euroclear or Cedel will be effected in the ordinary way in
accordance with their respective rules and operating procedures.
    
 
   
    Cross-market transfers of Exchange Notes between the participants in DTC, on
the one hand, and Euroclear or Cedel participants, on the other hand, will be
effected through DTC in accordance with DTC's rules on behalf of Euroclear or
Cedel, as the case may be, by its respective depositary. However,
    
 
                                       22
<PAGE>
   
such cross-market transactions will require delivery of instructions to
Euroclear or Cedel, as the case may be, by the counterparty in such system in
accordance with the rules and procedures and within the established Brussels
time deadlines of such system. Euroclear or Cedel, as the case may be, will, if
the transaction meets its settlement requirements, deliver instructions to its
respective depositary to take action to effect final settlement on its behalf by
delivering or receiving interests in the relevant global notes in DTC, and
making or receiving payment in accordance with normal procedures for same-day
funds settlement applicable to DTC. Euroclear participants and Cedel
participants may not deliver instructions directly to the depositaries for
Euroclear or Cedel.
    
 
   
    Because of time zone differences, the securities account of a Euroclear or
Cedel participant purchasing an interest in a global note from a participant in
DTC will be credited, and any such crediting will be reported to the relevant
Euroclear or Cedel participant, during the securities settlement processing day,
which must be a business day for Euroclear and Cedel, immediately following the
settlement date of DTC. Cash received in Euroclear or Cedel as a result of sales
of interest in a Global Note by or through a Euroclear or Cedel participant to a
participant in DTC will be received with value on the settlement date of DTC but
will be available in the relevant Euroclear or Cedel cash account only as of the
business day for Euroclear or Cedel following DTC's settlement date.
    
 
   
    Although DTC, Euroclear and Cedel have agreed to the foregoing procedures to
facilitate transfers of interests in the global notes among participants in DTC,
Euroclear and Cedel, they are under no obligation to perform or to continue to
perform such procedures, and such procedures may be discontinued at any time.
Neither the Company nor the trustee will have any responsibility for the
performance by DTC, Euroclear or Cedel or their respective participants or
indirect participants of their respective obligations under the rules and
procedures governing their operations.
    
 
CERTIFICATED EXCHANGE NOTES
 
    If:
 
   
        1. the Company notifies the trustee in writing that DTC is no longer
    willing or able to act as a depositary or DTC ceases to be registered as a
    clearing agency under the Exchange Act and a successor depositary is not
    appointed within 90 days of such notice or cessation,
    
 
   
        2. the Company, at its option, notifies the trustee in writing that it
    elects to cause the issuance of Exchange Notes in definitive form under the
    Indenture, or
    
 
   
        3. upon the occurrence of certain other events as provided in the
    Indenture, then,
    
 
   
upon surrender by DTC of the global notes representing the Exchange Notes,
certificated Exchange Notes will be issued in the names and denominations
requested by DTC in accordance with its customary procedures. Upon any such
issuance, the trustee is required to register such certificated Exchange Notes
in the name of such person or persons, or the nominee of any thereof, and cause
the same to be delivered thereto.
    
 
                                       23
<PAGE>
   
    Neither the Company nor the trustee shall be liable for any delay by DTC or
any DTC participant or indirect participant in identifying the beneficial owners
of the related Exchange Notes and each such person may conclusively rely on, and
shall be protected in relying on, instructions from DTC for all purposes.
    
 
CERTAIN COVENANTS
 
   
    The Indenture contains, among others, the covenants described below. Some
capitalized terms used in this section are defined under "Definitions" below.
    
 
LIMITATIONS ON LIENS
 
   
    The Company covenants that, so long as any debt securities issued under the
Indenture, including any of the notes, remain outstanding, but subject to
defeasance, as provided in the Indenture, it will not, and will not permit any
Restricted Subsidiary to incur any indebtedness which is secured by a mortgage,
pledge, security interest, lien or encumbrance (each a "lien") upon:
    
 
    - any Principal Property
 
   
    - any shares of stock of or indebtedness issued by any Restricted
      Subsidiary,
    
 
   
whether now owned or hereafter acquired, without effectively providing that, for
so long as such lien shall continue in existence with respect to such secured
indebtedness, the debt securities issued under the Indenture, including the
notes, together with, if the Company shall so determine, any other indebtedness
of the Company ranking equally with such debt securities, shall be equally and
ratably secured with, or at the Company's option prior to, such secured
indebtedness. The foregoing restriction shall not apply to:
    
 
   
        1. liens that exist when the applicable debt securities are issued;
    
 
   
        2. liens on the stock, assets or indebtedness of a person that exist
    when:
    
 
   
       - such person becomes a Restricted Subsidiary unless created in
         contemplation of such Restricted Subsidiary becoming such,
    
 
   
       - such person is merged into the Company or a subsidiary of the Company
         or
    
 
   
       - at the time the Company or a Restricted Subsidiary purchases, leases or
         otherwise acquires as an entirety or substantially as an entirety the
         assets of such person;
    
 
   
        3. liens on any Principal Property that exist:
    
 
   
       - when the Company or any Restricted Subsidiary acquired such Principal
         Property,
    
 
   
       - to secure the payment or indebtedness for the financing of the purchase
         price of such Principal Property, or
    
 
   
       - to secure indebtedness incurred for the purpose of the financing of all
         or any part of improvements or construction on such Principal Property,
         which indebtedness in each case is incurred before, at the time of, or
         within one year after the acquisition of such Principal Property, or in
         the case of real property, completion of such improvement or
         construction or commencement of full operation of such property,
         whichever is later;
    
 
   
        4. liens that secure indebtedness owed by any Restricted Subsidiary to
    the Company, Tyco or a subsidiary of the Company or by the Company to Tyco;
    
 
   
        5. liens in favor of any country or state, or political subdivision
    thereof:
    
 
       - to secure payments pursuant to any contract, statute, rule or
         regulation or
 
   
       - to secure any indebtedness incurred for the purpose of financing all or
         any part of the purchase price, or, in the case of real property, the
         cost of construction or improvement, of
    
 
                                       24
<PAGE>
         the Principal Property subject to such liens, including, but not
         limited to, liens incurred in connection with pollution control,
         industrial revenue or similar financings;
 
   
        6. liens or deposits under worker's compensation or similar legislation,
    or in connection with bids, tenders, contracts, other than for the payment
    of money, or leases to which the Company or any Restricted Subsidiary is a
    party, or to secure the public or statutory obligations of the Company or
    any Restricted Subsidiary, or in connection with obtaining or maintaining
    self-insurance, or to obtain the benefits of any law, regulation or
    arrangement pertaining to unemployment insurance, old age pensions, social
    security or similar matters, or to secure surety, performance, appeal or
    customs bonds to which the Company or any Restricted Subsidiary is a party,
    or in litigation or other proceedings in connection with the matters
    heretofore referred to in this clause, such as, but not limited to,
    interpleader proceedings, and other similar pledges, liens or deposits made
    or incurred in the ordinary course of business;
    
 
   
        7. certain liens in connection with legal proceedings, as provided in
    the Indenture;
    
 
   
        8. liens for certain taxes or assessments, landlord's liens and liens
    and charges incidental to the conduct of the business of the Company or any
    Restricted Subsidiary, or the ownership of their respective assets, which
    were not incurred in connection with the borrowing of money or the obtaining
    of advances or credit and which do not, in the opinion of the Board of
    Directors of the Company, materially impair the use of such assets in the
    operation of the business of the Company or such Restricted Subsidiary or
    the value of such Principal Property for the purposes thereof;
    
 
   
        9. liens to secure the Company's or any Restricted Subsidiary's
    obligations under agreements with respect to spot, forward, future and
    option transactions, entered into in the ordinary course of business;
    
 
   
        10. liens not permitted by the foregoing clauses 1 to 9, inclusive, if
    at the time of, and after giving effect to, the creation or assumption of
    such lien, the aggregate amount of all outstanding indebtedness of the
    Company and its Restricted Subsidiaries, without duplication, secured by all
    liens not permitted by the foregoing clauses 1 through 9, inclusive,
    together with the Attributable Debt in respect of Sale and Lease-Back
    Transactions permitted by paragraph 1 under "Limitation on Sale and
    Lease-Back Transactions" below does not exceed the greater of $100,000,000
    and 10% of Consolidated Net Worth; and
    
 
   
        11. any total or partial extension, renewal or replacement of any lien
    permitted pursuant to exceptions 1 through 10, inclusive, except that the
    principal amount of indebtedness secured by such extension, renewal or
    replacement, unless otherwise excepted under clauses 1 through 10, shall not
    exceed the principal amount of indebtedness of the original permitted lien,
    and that such extension, renewal or replacement shall be limited to all or
    part of the assets, or any replacement therefor, which secured the original
    lien, plus improvements and construction on real property.
    
 
LIMITATION ON SALE AND LEASE-BACK TRANSACTIONS
 
   
    The Company will not, and will not permit any Restricted Subsidiary to,
enter into any Sale and Lease-Back Transaction with respect to a Principal
Property unless:
    
 
   
        1. the Company or such Restricted Subsidiary would, at the time of
    entering into a Sale and Lease-Back Transaction, be entitled to incur
    indebtedness secured by a lien on the Principal Property to be leased in an
    amount at least equal to the Attributable Debt in respect of such
    transaction, without equally and ratably securing the debt securities issued
    under the Indenture, including the notes, pursuant to the provisions
    described under "Limitations on Liens" above, or
    
 
   
        2. the direct or indirect proceeds of the sale of the Principal Property
    to be leased are at least equal to their fair value, as determined by the
    Company's Board of Directors, and an amount equal to the net proceeds is
    applied, within 180 days of the effective date of such transaction, to the
    purchase or acquisition, or, in the case of real property, commencement of
    the construction, of
    
 
                                       25
<PAGE>
   
    property or assets or to the retirement of the debt securities issued under
    the Indenture, other than at maturity or pursuant to a mandatory sinking
    fund or a mandatory redemption provision, or of Funded Indebtedness of the
    Company or a consolidated subsidiary of the Company that ranks on a parity
    with or senior to the debt securities issued under the Indenture, subject to
    credits for certain voluntary retirement of Funded Indebtedness and certain
    delivery of debt securities issued under the Indenture to the trustee for
    retirement and cancellation.
    
 
LIMITATION ON INDEBTEDNESS OF SUBSIDIARIES
 
   
    (a) The Company will not cause or permit any subsidiary, which is not a
guarantor of the debt securities issued under the Indenture, directly or
indirectly, to create, incur, assume, guarantee or otherwise in any manner
become liable for the payment of or otherwise incur (collectively, "incur"), any
indebtedness, including any Acquired Indebtedness but excluding any Permitted
Subsidiary Indebtedness, unless such subsidiary simultaneously executes and
delivers a supplemental indenture providing for a guarantee of the debt
securities issued under the Indenture, including the notes.
    
 
   
    (b) Notwithstanding the foregoing, any guarantee by a subsidiary of the
Company of the debt securities issued under the Indenture, including any
guarantee by a subsidiary of any of the notes, shall provide by its terms that
it, and all liens securing the same, shall be automatically and unconditionally
released and discharged upon
    
 
   
        1. any sale, exchange or transfer, to any person not an Affiliate of the
    Company, of all of the Company's equity interests in, or all or
    substantially all the assets of, such subsidiary, which transaction is in
    compliance with the terms of the Indenture and such subsidiary is released
    from all guarantees, if any, by it of other indebtedness of the Company or
    any subsidiaries,
    
 
   
        2. the payment in full of all obligations under the indebtedness giving
    rise to such guarantee, or
    
 
   
        3. with respect to indebtedness described in clause (a) above
    constituting guarantees of indebtedness, the release by the holders of such
    indebtedness of the guarantee by such subsidiary, including any deemed
    release upon payment in full of all obligations under such indebtedness, at
    such time as
    
 
   
       - no other indebtedness, other than Permitted Subsidiary Indebtedness,
         has been guaranteed by such subsidiary, as the case may be, or
    
 
   
       - the holders of all such other indebtedness which is guaranteed by such
         subsidiary also release the guarantee by such subsidiary, including any
         deemed release upon payment in full of all obligations under such
         indebtedness.
    
 
    (c) For purposes of this covenant, any Acquired Indebtedness shall not be
deemed to have been incurred until 180 days from the date
 
   
        1.  the person obligated on such Acquired Indebtedness becomes a
    subsidiary of the Company or
    
 
   
        2.  the acquisition of assets in connection with which such Acquired
    Indebtedness was assumed is consummated.
    
 
DEFINITIONS
 
   
    "Acquired Indebtedness" means indebtedness of a person:
    
 
   
        1. existing at the time such person becomes a Restricted Subsidiary or
    
 
   
        2. assumed in connection with the acquisition of assets by such person,
    in each case, other than indebtedness incurred in connection with, or in
    contemplation of, such person becoming a Restricted Subsidiary or such
    acquisition, as the case may be.
    
 
                                       26
<PAGE>
    "Affiliate" means, with respect to any specified Person:
 
   
        1. any other person directly or indirectly controlling or controlled by
    or under direct or indirect common control with such specified person;
    
 
   
        2. any other person that owns, directly or indirectly, 10% or more of
    such specified person's capital stock or any officer or director of any such
    specified person or other person; or
    
 
   
        3. any other person 10% or more of the voting stock of which is
    beneficially owned or held directly or indirectly by such specified person.
    
 
   
For the purposes of this definition, "control" when used with respect to any
specified person means the power to direct the management and policies of such
person, directly or indirectly, whether through ownership of voting securities,
by contract or otherwise; and the terms "controlling" and "controlled" have
meanings correlative to the foregoing.
    
 
   
    "Attributable Debt" means in connection with a Sale and Lease-Back
Transaction, as of any particular time, the aggregate of present values,
discounted at a rate per annum equal to the average interest borne by all
outstanding debt securities issued under the indenture determined on a weighted
average basis and compounded semi-annually, of the obligations of the Company or
any Restricted Subsidiary for net rental payments during the remaining term of
the applicable lease, including any period for which such lease has been
extended or may, at the option of the lessor, be extended. The term "net rental
payments" under any lease of any period shall mean the sum of the rental and
other payments required to be paid in such period by the lessee thereunder, not
including, however, any amounts required to be paid by such lessee, whether or
not designated as rental or additional rental, on account of maintenance and
repairs, reconstruction, insurance, taxes, assessments, water rates or similar
charges required to be paid by such lessee thereunder or any amounts required to
be paid by such lessee thereunder contingent upon the amount of sales,
maintenance and repairs, reconstruction, insurance, taxes, assessments, water
rates or similar charges.
    
 
   
    "Consolidated Net Worth" means, at any date, the total assets less the total
liabilities, in each case appearing on the most recently prepared consolidated
balance sheet of the Company and its subsidiaries as of the end of a fiscal
quarter of the Company, prepared in accordance with United States generally
accepted accounting principles as in effect on the date of calculation.
    
 
   
    "Consolidated Tangible Assets" means, at any date, the total assets less all
intangible assets appearing on the most recently prepared consolidated balance
sheet of the Company and its subsidiaries as of the end of a fiscal quarter of
the Company, prepared in accordance with United States generally accepted
accounting principles as in effect on the date of calculation. "Intangible
Assets" means the amount, if any, which would be stated under the heading "Costs
in Excess of Net Assets of Acquired Companies" or under any other heading
relating to intangible assets separately listed, in each case on the face of the
aforesaid consolidated balance sheet.
    
 
   
    "Funded Indebtedness" means any indebtedness maturing by its terms more than
one year from the date of the determination thereof, including any indebtedness
renewable or extendible at the option of the obligor to a date later than one
year from the date of the determination thereof.
    
 
    "Permitted Subsidiary Indebtedness" means any of the following:
 
   
        1. indebtedness in an aggregate amount, without duplication, not to
    exceed, as of the date of determination, 5% of the Consolidated Tangible
    Assets of the Company, excluding any indebtedness described in clauses 2
    through 8 below;
    
 
   
        2. indebtedness owed to the Company, Tyco or any subsidiary of the
    Company;
    
 
   
        3. obligations under standby letters of credit or similar arrangements
    supporting the performance of a person under a contract or agreement in the
    ordinary course of business;
    
 
        4. obligations as lessee in the ordinary course of business which are
    capitalized in accordance with United States generally accepted accounting
    principles;
 
                                       27
<PAGE>
   
        5. indebtedness that was Permitted Subsidiary Indebtedness at the time
    that it was first incurred;
    
 
   
        6. Acquired Indebtedness that by its terms is not callable or redeemable
    prior to its stated maturity and that remains outstanding following such
    time as the subsidiary obligated under such Acquired Indebtedness in good
    faith has made or caused to be made an offer to acquire all such
    indebtedness, including, without limitation, an offer to exchange such
    indebtedness for securities of the Company, on terms which, in the opinion
    of an independent investment banking firm of national reputation and
    standing, are consistent with market practices in existence at the time for
    offers of a similar nature, provided that the initial expiration date of any
    such offer shall be not later than the expiration of the time period set
    forth in paragraph (c) of the "Limitation on Indebtedness of Subsidiaries"
    covenant;
    
 
   
        7. indebtedness outstanding on the date of the Indenture; and
    
 
   
        8. any renewals, extensions, substitutions, refundings, refinancings or
    replacements (collectively, a "refinancing") of any indebtedness referred to
    in clause 7 of this definition of "Permitted Subsidiary Indebtedness" of a
    subsidiary organized under a jurisdiction other than the United States or
    any State thereof or the District of Columbia, including any successive
    refinancings so long as the borrower under such refinancing is such
    subsidiary and the aggregate principal amount of indebtedness represented
    thereby, or if such indebtedness provides for an amount less than the
    principal amount thereof to be due and payable upon a declaration of
    acceleration of the maturity thereof, the original issue price of such
    indebtedness plus any accreted value attributable thereto since the original
    issuance of such indebtedness, is not increased by such refinancing plus the
    lesser of (A) the stated amount of any premium or other payment required to
    be paid in connection with such a refinancing pursuant to the terms of the
    indebtedness being refinanced or (B) the amount of premium or other payment
    actually paid at such time to refinance the indebtedness, plus, in either
    case, the amount of expenses of such subsidiary incurred in connection with
    such refinancing.
    
 
   
    "Principal Property" means any manufacturing, processing or assembly plant
or facility or any warehouse or distribution facility which is used by any U.S.
subsidiary of the Company after the date of the Indenture, other than any such
plants, facilities, warehouses or portions thereof, which in the opinion of the
Board of Directors of the Company, are not collectively of material importance
to the total business conducted by the Company and its Restricted Subsidiaries
as an entirety, or which, in each case, has a book value, on the date of the
acquisition or completion of the initial construction thereof by the Company, of
less than 1.5% of Consolidated Tangible Assets.
    
 
   
    "Restricted Subsidiary" means any subsidiary of the Company which owns or
leases a Principal Property.
    
 
   
    "Sale and Lease-Back Transaction" means an arrangement with any person
providing for the leasing by the Company or a Restricted Subsidiary of any
Principal Property whereby such Principal Property has been or is to be sold or
transferred by the Company or a Restricted Subsidiary to such Person; provided,
however, that the foregoing shall not apply to any such arrangement involving a
lease for a term, including renewal rights, for not more than three years.
    
 
MERGER, CONSOLIDATION, SALE OR CONVEYANCE
 
   
    The Indenture provides that neither the Company, Tyco nor any other
guarantor of the notes or any other debt securities issued under the Indenture
will merge or consolidate with any other corporation and will not sell or convey
all or substantially all of its assets to any person, unless:
    
 
   
        1. the Company, Tyco or such other guarantor, as the case may be, shall
    be the continuing corporation, or
    
 
                                       28
<PAGE>
   
        2. the successor corporation or person that acquires all or
    substantially all of the assets of the Company, Tyco or such other
    guarantor, as the case may be, shall expressly assume,
    
 
   
    - the payment of principal of, premium, if any, and interest on the notes
      and all other debt securities issued under the Indenture, and
    
 
   
    - the observance of all the covenants and agreements under the indenture to
      be performed or observed by the Company, Tyco or such other guarantor, as
      the case may be,
    
 
   
and in either case, immediately after such merger, consolidation, sale or
conveyance, the Company, Tyco or such other guarantor, as the case may be, or
such successor corporation or person, as the case may be, shall not be in
default in the performance of the covenants and agreements of the indenture to
be performed or observed by the Company, Tyco or such other guarantor, as the
case may be; provided that the foregoing shall not apply to a guarantor other
than Tyco if in connection with any such merger, consolidation, sale or
conveyance the guarantee of such guarantor is released and discharged pursuant
to paragraph (b) of the "Limitation on Indebtedness of Subsidiaries" covenant
described above.
    
 
EVENTS OF DEFAULT
 
   
    An event of default with respect to a series of debt securities issued under
the Indenture, including the notes, is defined in the Indenture as being:
    
 
   
    - default for 30 days in payment of any interest on any debt securities of
      such series;
    
 
   
    - default in any payment of principal of or premium, if any, on any debt
      securities of such series, including any sinking fund payment;
    
 
   
    - default by the Company, Tyco or any other guarantor in performance of any
      other of the covenants or agreements in respect of the debt securities of
      such series and related guarantees or the Indenture that continues for 90
      days after the Company receives notice of such failure in accordance with
      the Indenture;
    
 
   
    - default by the Company, Tyco or any other guarantor of the debt securities
      in the payment at the final maturity thereof, after the expiration of any
      applicable grace period, of principal of, premium, if any, or interest on
      indebtedness for money borrowed, other than non-recourse indebtedness, in
      the principal amount then outstanding of $50,000,000 or more, or
      acceleration of any indebtedness in such principal amount so that it
      becomes due and payable prior to the date on which it would otherwise have
      become due and payable and such acceleration is not rescinded within ten
      business days after notice to the Company in accordance with the
      Indenture;
    
 
   
    - any guarantee of the debt securities ceases to be, or the Company or any
      guarantor of the debt securities asserts in writing that such guarantee is
      not, in full force and effect and enforceable in accordance with its
      terms; or
    
 
    - certain events involving bankruptcy, insolvency or reorganization of the
      Company, Tyco or any Significant Subsidiary Guarantor.
 
   
    The Indenture provides that the trustee shall transmit notice of any uncured
default under the Indenture with respect to any series of debt securities issued
thereunder, within 90 days after the occurrence of such default, to the holders
of the debt securities of each affected series, except that the trustee may
withhold notice to the holders of any series the debt securities of any default,
except in payment of principal of, premium, if any, or interest on such series,
if the trustee considers it in the interest of the holders of such series the
debt securities to do so.
    
 
   
    If an event of default due to the default in payment of principal of,
premium, if any, or interest on any series of debt securities issued under the
Indenture or due to the default in the performance or breach of any other
covenant or agreement of the Company, Tyco or any guarantor applicable to the
debt securities of such series but not applicable to all outstanding debt
securities issued under the
    
 
                                       29
<PAGE>
   
Indenture shall have occurred and be continuing, either the trustee or the
holders of not less than 25% in principal amount of the debt securities of such
series then outstanding may declare the principal of all debt securities of such
series and interest accrued thereon to be due and payable immediately.
    
 
   
    If an event of default due to a default in the performance of any other of
the covenants or agreements in the Indenture applicable to all outstanding debt
securities issued thereunder and then outstanding, or due to a default in
payment at final maturity or upon acceleration of indebtedness for
money borrowed in the principal amount then outstanding of $50,000,000 or more,
or to certain events of bankruptcy, insolvency and reorganization of the
Company, Tyco or any Significant Subsidiary Guarantor shall have occurred and be
continuing, either the trustee or the holders of not less than 25% in principal
amount of all debt securities issued under the Indenture and then outstanding,
treated as one class, may declare the principal of all such debt securities and
interest accrued thereon to be due and payable immediately.
    
 
   
    Upon certain conditions, such declarations may be annulled and past defaults
may be waived, except a non-payment of such debt securities which shall have
become due by acceleration, by the holders of a majority in principal amount of
the outstanding debt securities of an affected series, voting as a separate
class, or all debt securities outstanding under the Indenture, voting as a
single class, as the case may be.
    
 
   
    The holders of a majority in principal amount of the outstanding debt
securities of each affected series shall have the right to direct the time,
method and place of conducting any proceeding for any remedy available to the
trustee with respect to the notes of such series, subject to certain limitations
specified in the Indenture.
    
 
   
    The Indenture provides that no holder of debt securities of any series may
institute any action against the Company under the Indenture, except actions for
payment of overdue principal, premium, if any, or interest, unless such holder
previously shall have given to the trustee written notice of default and
continuance thereof and unless the holders of not less than 25% in principal
amount of the debt securities of such series then outstanding shall have
requested the trustee to institute such action and shall have offered the
trustee reasonable indemnity, and the trustee shall not have instituted such
action within 60 days of such request, and the trustee shall not have received
direction inconsistent with such written request by the holders of a majority in
principal amount of the debt securities of such series then outstanding.
    
 
   
    The Indenture requires the annual filing by the Company with the trustee of
a written statement as to compliance with the covenants and agreements contained
in the Indenture.
    
 
   
    "Significant Subsidiary Guarantor" means any one or more guarantors, other
than Tyco, which, at the date of determination, together with its or their
respective subsidiaries in the aggregate,
    
 
    - for the most recently completed fiscal year of the Company accounted for
      more than 10% of the consolidated revenues of the Company, or
 
   
    - at the end of such fiscal year, was the owner, beneficial or otherwise, of
      more than 10% of the consolidated assets of the Company, as determined in
      accordance with United States generally accepted accounting principles and
      reflected on the Company's consolidated financial statements.
    
 
DISCHARGE, DEFEASANCE AND COVENANT DEFEASANCE
 
   
    The Company may discharge or defease its obligations under the Indenture as
set forth below.
    
 
   
    Under terms satisfactory to the trustee, the Company may discharge the
indenture with respect to any series of debt securities issued under the
Indenture, including the notes, which have not already been delivered to the
trustee for cancellation and which have either become due and payable or are by
their terms due and payable within one year, or which may be called for
redemption within one year, by irrevocably depositing with the trustee cash or
direct obligations of the United States as trust funds in an amount certified to
be sufficient to pay at maturity, or upon redemption, the principal of,
    
 
                                       30
<PAGE>
   
premium, if any, and interest and Additional Amounts, if any, on such debt
securities. However, the Company may not thereby avoid its duty to register the
transfer or exchange of such series of debt securities, to replace any
mutilated, destroyed, lost or stolen notes of such series or to maintain an
office or agency in respect of such series.
    
 
   
    In the case of any series of debt securities in respect of which the exact
amounts of principal of and interest due on such series can be determined at the
time of making the deposit referred to below, the Company at its option at any
time may also:
    
 
   
        1. discharge any and all of its obligations to holders of such series of
    debt securities ("defeasance"), but may not thereby avoid its duty to
    register the transfer or exchange of such series of debt securities, to
    replace any mutilated, destroyed, lost, or stolen debt securities of such
    series or to maintain an office or agency in respect of such series of debt
    securities; or
    
 
   
        2. be released with respect to such series of debt securities from the
    obligations imposed by the covenants described under the captions "Certain
    Covenants" and "Merger, Consolidation, Sale or Conveyance" above and omit to
    comply with such covenants without creating an event of default ("covenant
    defeasance").
    
 
    Defeasance or covenant defeasance may be effected only if, among other
things:
 
   
        1. the Company or Tyco irrevocably deposits with the trustee cash and/or
    direct obligations of the United States, as trust funds in an amount
    certified by a nationally recognized firm of independent public accountants
    or a nationally recognized investment banking firm to be sufficient to pay
    each installment of principal of, premium, if any, and interest and
    Additional Amounts, if any, on all outstanding debt securities of the
    relevant series on the dates such installments of principal, premium, if
    any, and interest are due;
    
 
   
        2. no default or event of default shall have occurred and be continuing
    on the date of the deposit referred to in clause 1 or, in respect of certain
    events of bankruptcy, insolvency or reorganization, during the period ending
    on the 91st day after the date of such deposit, or any longer applicable
    preference period; and
    
 
   
        3. the Company delivers to the trustee:
    
 
   
        (A) an opinion of counsel to the effect that the holders of such series
    of debt securities
    
 
           -  will not recognize any income, gain or loss for United States
               federal income tax purpose as a result of such deposit and
               defeasance or covenant defeasance, as applicable, and
 
   
           -  will be subject to United States federal income tax on the same
               amounts and in the same manner and at the same times as would
               have been the case if such deposit and defeasance or covenant
               defeasance, as applicable, had not occurred.
    
 
   
       In the case of defeasance, such opinion must be based on a ruling of the
       Internal Revenue Service or a change in United States federal income tax
       law occurring after the date of the Indenture; and
    
 
   
        (B) an opinion of counsel to the effect that
    
 
           -  payments from the defeasance trust will be free and exempt from
               any and all withholding and other taxes imposed or levied by or
               on behalf of Luxembourg or any political subdivision thereof
               having the power to tax, and
 
   
           -  holders of such series of debt securities will not recognize any
               income, gain or loss for Luxembourg income tax and other
               Luxembourg tax purposes as a result of such deposit and
               defeasance or covenant defeasance, as applicable, and will be
               subject to Luxembourg income tax and other Luxembourg tax on the
               same amounts, in the
    
 
                                       31
<PAGE>
               same manner and at the same times as would have been the case if
               such deposit and defeasance or covenant defeasance, as
               applicable, had not occurred.
 
MODIFICATION OF THE INDENTURE
 
   
    The Indenture contains provisions permitting the Company, Tyco and the
trustee, with the consent of the holders of not less than a majority of
principal amount of the debt securities issued under the Indenture at the time
outstanding of all series affected, voting as one class, to modify the Indenture
or any supplemental indenture or the rights of the holders of the debt
securities, including the notes. The Indenture cannot be modified to:
    
 
   
        1. extend the final maturity of any of the debt securities or reduce the
    principal amount thereof, or reduce the rate or extend the time of payment
    of interest thereon, or reduce any amount payable on redemption thereof, or
    reduce the amount of any original issue discount security payable upon
    acceleration or provable in bankruptcy or impair or affect the right of any
    holder of the debt securities to institute suit for the payment thereof
    without the consent of the holder of each of the debt securities so affected
    or
    
 
   
        2. reduce the aforesaid percentage in principal amount of debt
    securities, the consent of the holders of which is required for any such
    modification, without the consent of the holders of all debt securities then
    outstanding.
    
 
   
    The Indenture contains provisions permitting the Company, Tyco and the
trustee, without the consent of any holders of debt securities, to enter into a
supplemental indenture, among other things, for purposes of curing any ambiguity
or correcting or supplementing any provision contained in the Indenture or in
any supplemental indenture or making other provisions in regard to the matters
or questions arising under the Indenture or any supplemental indenture as the
Board of Directors of the Company deems necessary or desirable and which does
not adversely affect the interests of the holders of debt securities in any
material respect. The Company, Tyco and the trustee, without the consent of any
holders of notes, may also enter into a supplemental indenture to establish the
form or terms of any series of debt securities as are not otherwise inconsistent
with any of the provisions of the Indenture.
    
 
CONCERNING THE TRUSTEE
 
   
    The trustee may hold debt securities issued under the Indenture, including
the notes, act as a depository for funds of, make loans to, or perform other
services for, Tyco, the Company and their subsidiaries as if it were not the
trustee.
    
 
                        ENFORCEMENT OF CIVIL LIABILITIES
 
   
    The Company and Tyco have consented in the Indenture to jurisdiction in the
United States federal and state courts in The City of New York and to service of
process in The City of New York in any legal suit, action or proceeding brought
to enforce any rights under or with respect to the Indenture, the notes and the
guarantees of the notes. However, substantially all of the Company's directly
held assets consists of shares in its wholly-owned subsidiary Tyco Group
S.a.r.l., a Luxembourg company which, through its subsidiaries, owns
substantially all of the assets of the Company. Substantially all of Tyco's
directly held assets consists of shares in the Company. Accordingly, any
judgment against the Company or Tyco in respect of the Indenture, the notes or
the guarantees, including for civil liabilities under the United States federal
securities laws, obtained in any United States federal or state court may have
to be enforced in the courts of Luxembourg. Investors should not assume that the
courts of Luxembourg would enforce judgments of United States courts obtained
against the Company or Tyco predicated upon the civil liability provisions of
the United States federal securities laws or that such courts would enforce, in
original actions, liabilities against the Company or Tyco predicated solely upon
such laws.
    
 
                                       32
<PAGE>
   
          UNITED STATES FEDERAL INCOME AND LUXEMBOURG TAX CONSEQUENCES
    
 
   
    The following discussion is intended to be a general summary of Luxembourg
and United States federal income tax consequences to holders of notes. Due to
the complexity of the tax laws of these and other taxing jurisdictions, the
uncertainty, in some instances, as to the manner in which such laws apply to
holders and possible changes in law, it is particularly important that each
holder consult with its own tax adviser regarding the tax treatment of the
acquisition, ownership, disposition and exchange of notes under the laws of any
United States federal, state, local or other taxing jurisdiction.
    
 
LUXEMBOURG
 
   
    Under current law, no withholding or deduction is imposed in Luxembourg in
respect of any payment to be made by the Company in respect of the notes.
Holders of notes who are neither resident in Luxembourg nor engaged in a trade
or business through a permanent establishment or permanent representative in
Luxembourg will not be subject to taxes or duties in Luxembourg with respect to
interest payments on, or gains realized on the disposition of, the notes. No
stamp, registration or similar taxes, duties or charges are payable in
Luxembourg in connection with the issuance of the notes.
    
 
UNITED STATES
 
   
    The following is a general discussion of anticipated U.S. federal income tax
consequences of the ownership and disposition of the notes to holders thereof
and of the exchange of Restricted Notes for Exchange Notes pursuant to the
exchange offer. This summary is based upon laws, regulations, rulings and
decisions currently in effect, all of which are subject to change at any time,
possibly with retroactive effect. Moreover, it deals only with purchasers who
hold notes as "capital assets" within the meaning of Section 1221 of the U.S.
Internal Revenue Code of 1986 and does not purport to deal with persons in
special tax situations, such as financial institutions, insurance companies,
regulated investment companies, tax exempt investors, dealers in securities or
currencies, U.S. expatriates, persons holding notes as a hedge against currency
risk or as a position in a "straddle," "hedge," "conversion" or another
integrated transaction for tax purposes, persons who own, directly or
indirectly, 10 percent or more of the voting power of the Company, or U.S.
Holders, as defined below, whose functional currency is not the U.S. dollar.
Further, this discussion does not address the consequences under U.S. federal
estate or gift tax laws or the laws of any U.S. state or locality.
    
 
   
    Holders of Restricted Notes are urged to consult their own tax advisors
concerning the consequences, in their particular circumstances, of the ownership
and disposition of the notes and the exchange of Restricted Notes for Exchange
Notes pursuant to the exchange offer under the U.S. federal tax laws and the
laws of any relevant state, local or non-U.S. taxing jurisdiction.
    
 
   
    As used in this section, the term "U.S. Holder" means a beneficial owner of
notes that is, for U.S. federal income tax purposes:
    
 
    - a citizen or resident of the United States,
 
   
    - a corporation, partnership or other entity, other than a trust, created or
      organized in or under the laws of the United States or of any political
      subdivision thereof, other than a partnership that is not treated as a
      U.S. person under any applicable U.S. Treasury regulations,
    
 
   
    - an estate whose income is subject to U.S. federal income tax regardless of
      its source, or
    
 
   
    - a trust if, in general, a court within the U.S. is able to exercise
      primary jurisdiction over its administration and one or more U.S. persons
      have authority to control all of its substantial decisions.
    
 
                                       33
<PAGE>
   
    As used in this section, the term "non-U.S. Holder" means a beneficial owner
of notes that is not a U.S Holder for U.S. federal income tax purposes.
    
 
THE EXCHANGE OFFER
 
   
    An exchange of Restricted Notes for Exchange Notes pursuant to the exchange
offer should not be treated as an exchange or other taxable event for United
States federal income tax purposes. Accordingly, there should be no United
States federal income tax consequences to holders of Restricted Notes who
exchange Restricted Notes for Exchange Notes pursuant to the exchange offer, and
any holder should have the same adjusted tax basis and holding period in the
Exchange Notes as it had in the Restricted Notes immediately before the
exchange.
    
 
U.S. HOLDERS
 
INTEREST AND DISPOSITION GENERALLY
 
   
    The gross amount of interest paid on the notes, including any Additional
Amounts paid in respect of withholding taxes, will be taxable as ordinary income
for U.S. federal income tax purposes when received or accrued by a U.S. Holder
in accordance with such U.S. Holder's method of tax accounting. Such interest
will be income from sources outside the United States and, with certain
exceptions, will be treated as "passive" income for purposes of computing the
foreign tax credit allowable under U.S. federal income tax laws. The rules
relating to foreign tax credits and the timing thereof are extremely complex,
and U.S. Holders should consult their own tax advisers with regard to the
availability of foreign tax credits and the application of the foreign tax
credit limitations to their particular situations.
    
 
   
    Upon the sale, redemption or other taxable disposition of a note, a U.S.
Holder will recognize capital gain or loss equal to the difference between the
amount realized, excluding any amount attributable to accrued interest, which
will be taxable as ordinary interest income as described above, or accrued
market discount which is described below, and the U.S. Holder's tax basis in the
notes, generally the U.S. Holder's cost. Such gain or loss will be long term
capital gain or loss if the notes are held for more than one year. The
deductibility of capital losses is subject to certain limitations. For purposes
of foreign tax credits under U.S. federal income tax laws, capital gain or loss
recognized by a U.S. Holder generally will be treated as U.S. source. U.S.
Holders should consult their own tax advisors as to the foreign tax credit
implications of the disposition of notes under U.S. federal income tax laws.
    
 
   
    Special rules apply to notes acquired at a market discount or premium, which
are discussed below.
    
 
BOND PREMIUM
 
   
    If a U.S. Holder purchased notes for an amount in excess of the amount
payable at the maturity date of the notes, the U.S. Holder may deduct such
excess as amortizable bond premium over the term of the notes under a
yield-to-maturity formula. The deduction is available only if an election is
made by the purchaser or if such election is in effect. This election is
revocable only with the consent of the U.S. Internal Revenue Service. The
election applies to all obligations owned or subsequently acquired by the U.S.
Holder. The U.S. Holder's adjusted tax basis in the notes will be reduced to the
extent of the deduction of amortizable bond premium. The amortizable bond
premium is treated as an offset to interest income on the notes rather than as a
separate deduction item. A loss upon the disposition of a note generally will be
treated as foreign source for U.S. foreign tax credit purposes to the extent of
any unamortized bond premium on the notes that could have been deducted had an
election been made.
    
 
MARKET DISCOUNT
 
   
    If a U.S. Holder acquired the notes, other than in an original issue, at a
market discount which equals or exceeds 1/4 of 1% of the stated redemption price
of the notes at maturity multiplied by the
    
 
                                       34
<PAGE>
   
number of remaining complete years to maturity and thereafter recognizes gain
upon a disposition, or makes a gift, of the notes, the lesser of:
    
 
   
    1. such gain or, in the case of a gift, appreciation, or
    
 
   
    2. the portion of the market discount which accrued on a straight line
basis, or, if the U.S. Holder so elects, on a constant interest rate basis,
while the notes were held by such U.S. Holder
    
 
   
will be treated as ordinary income at the time of the disposition or gift. For
these purposes, market discount means the excess, if any, of the stated
redemption price at maturity over the basis of such notes immediately after
their acquisition by the U.S. Holder. A U.S. Holder may elect to include accrued
market discount in income currently, which would increase the U.S. Holder's
basis in the notes, rather than upon disposition of the notes. This election
once made applies to all market discount obligations acquired on or after the
first taxable year to which the election applies, and may not be revoked without
the consent of the Internal Revenue Service. For U.S. foreign tax credit
purposes, accrued market discount included as ordinary income will be treated as
income from foreign sources.
    
 
   
    A U.S. Holder of notes acquired at a market discount generally will be
required to defer the deduction of a portion of the interest on any indebtedness
incurred or maintained to purchase or carry such notes until the market discount
is recognized upon a subsequent disposition of such notes. Such a deferral is
not required, however, if the U.S. Holder elects to include accrued market
discount in income currently.
    
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
   
    Non-exempt U.S. Holders may be subject to information reporting with respect
to payments of interest on, and the proceeds of the disposition of, notes.
Non-exempt U.S. Holders who are subject to information reporting and who do not
provide appropriate information when requested may be subject to backup
withholding at a 31% rate. U.S. Holders should consult their tax advisors.
    
 
NON-U.S. HOLDERS
 
INTEREST AND DISPOSITION
 
   
    In general, and subject to the discussion below under "Information Reporting
and Backup Withholding," a non-U.S. Holder will not be subject to U.S. federal
income or withholding tax with respect to payments of interest on, or gain upon
the disposition of, notes, unless the income or gain is effectively connected
with the conduct by the non-U.S. Holder of a trade or business in the United
States. In that event, such income or gain will generally be subject to regular
U.S. income tax in the same manner as if it were realized by a U.S. Holder. In
addition, if such non-U.S. Holder is a non-U.S. corporation, such income or gain
may be subject to a branch profits tax at a rate of 30%, or such lower rate
provided by an applicable income tax treaty.
    
 
INFORMATION REPORTING AND BACKUP WITHHOLDING
 
   
    If the notes are held by a non-U.S. Holder through a non-U.S., and non-U.S.
related, broker or financial institution, information reporting and backup
withholding generally would not be required. Information reporting, and possibly
backup withholding, may apply if the notes are held by a non-U.S. Holder through
a U.S., or U.S. related, broker or financial institution and the non-U.S. Holder
fails to provide appropriate information. Holders should consult their tax
advisors.
    
 
                                       35
<PAGE>
                              PLAN OF DISTRIBUTION
 
   
    Each broker-dealer that receives Exchange Notes for its own account pursuant
to the exchange offer must acknowledge that it will deliver a prospectus in
connection with any resale of such Exchange Notes. This document, as it may be
amended or supplemented from time to time, may be used by a broker-dealer in
connection with resales of Exchange Notes or market-making activities or other
trading activities.
    
 
   
    The Company will not receive any proceeds from any sale of Exchange Notes by
broker-dealers. Exchange Notes received by broker-dealers for their own account
pursuant to the exchange offer may be sold from time to time in one or more
transaction in the over-the-counter market, in negotiated transactions, through
the writing of options on the Exchange Notes or a combination of such methods of
resale, at market prices prevailing at the time of resale, at prices related to
such prevailing market prices or at negotiated prices. Any such resale may be
made directly to purchaser or to or through brokers or dealers who may receive
compensation in the form commissions or concessions from any such broker-dealer
or the purchasers of any such Exchange Notes. Any broker-dealer that resells
Exchange Notes that were received by it for its own account pursuant to the
exchange offer and any broker or dealer that participates in a distribution of
such Exchange Notes may be deemed to be an "underwriter" within the meaning of
the Securities Act, and any profit on any such resale of Exchange Notes and any
commission or concessions received by any such persons may be deemed to be
underwriting compensation under the Securities Act. The Letters of Transmittal
state that, by acknowledging that it will deliver and by delivering a
prospectus, a broker-dealer will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.
    
 
   
    For a period starting on the date of this prospectus and ending on the close
of business on the earlier to occur of:
    
 
   
    1.  the date on which all Exchange Notes held by broker-dealers eligible to
       use the prospectus to satisfy their prospectus delivery obligations under
       the Securities Act have been sold and
    
 
   
    2.  the date 180 days after the consummation of the exchange offer,
    
 
   
the Company will make this document, as amended or supplemented, available to
any broker-dealer in connection with any such resale and will send additional
copies of this document and any amendment or supplement to this prospectus to
any broker-dealer that requests such documents.
    
 
   
    The Company has agreed to pay all expenses incident to the exchange offer,
including the expense of one counsel for the holders of the Restricted Notes,
other than commissions or concession of any broker-dealers and will indemnify
the holders of the Restricted Notes, including any broker-dealers, against
certain liabilities, including liabilities under the Securities Act.
    
 
                                 LEGAL MATTERS
 
   
    Certain U.S. legal matters regarding the notes and Tyco's guarantees of the
notes have been passed upon for Tyco and the Company by Kramer Levin Naftalis &
Frankel LLP, New York, New York. Joshua M. Berman, a director and vice president
of Tyco, is counsel to Kramer Levin Naftalis & Frankel LLP and beneficially owns
72,090 common shares of Tyco. Certain matters under the laws of Bermuda related
to the guarantees of Tyco of the notes will be passed upon for Tyco by Appleby,
Spurling & Kempe, Hamilton, Bermuda, Bermuda counsel to Tyco. Certain matters
under the laws of Luxembourg related to the notes will be passed upon by Beghin
Nothar Feider Loeff Claeys Verbeke, Luxembourg counsel to the Company. Kramer
Levin Naftalis & Frankel LLP has relied on Appleby, Spurling & Kempe with
respect to matters of Bermuda law and on Beghin Nothar Feider Loeff Claeys
Verbeke with respect to matters of Luxembourg law.
    
 
                                       36
<PAGE>
                                    EXPERTS
 
   
    The consolidated financial statements and financial statement schedule of
Tyco as of September 30, 1998 and 1997 and for the year ended September 30,
1998, the nine months ended September 30, 1997 and the year ended December 31,
1996, included in Tyco's Current Report on Form 8-K filed on December 10, 1998,
and incorporated by reference in this document, give retroactive effect to the
merger between Tyco International Ltd. and United States Surgical Corporation,
and have been audited by PricewaterhouseCoopers, independent accountants, as set
forth in their report included therein. In its report, that firm states that
with respect to certain subsidiaries its opinion is based upon the reports of
other independent accountants, namely Arthur Andersen LLP and Deloitte & Touche
LLP. The consolidated financial statements and financial statement schedule
referred to above have been incorporated herein in reliance upon said reports
given upon the authority of such firms as experts in accounting and auditing.
    
 
                                       37
<PAGE>
   
                                  $800,000,000
    
 
                               TYCO INTERNATIONAL
                                   GROUP S.A.
 
                               OFFER TO EXCHANGE
                               UP TO $400,000,000
                             5.875% NOTES DUE 2004
                          FOR ANY AND ALL OUTSTANDING
                             5.875% NOTES DUE 2004
                                      AND
                               UP TO $400,000,000
                             6.125% NOTES DUE 2008
                          FOR ANY AND ALL OUTSTANDING
                             6.125% NOTES DUE 2008
 
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
 
                                     [LOGO]
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
   
                               FEBRUARY   , 1999
    
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
    Bye-Law 102 of Tyco's Bye-Laws provides, in part, that Tyco shall indemnify
its directors and other officers for all costs, losses and expenses which they
may incur in the performance of their duties as director or officer, provided
that such indemnification is not otherwise prohibited under the Companies Act
1981 (as amended) of Bermuda. Section 98 of the Companies Act 1981 (as amended)
prohibits such indemnification against any liability arising out of fraud or
dishonesty of the director or officer. However, such section permits Tyco to
indemnify a director or officer against any liability incurred by him in
defending any proceedings, whether civil or criminal, in which judgment is given
in his favor or in which he is acquitted or when other similar relief is granted
to him.
 
    Tyco maintains $75 million of insurance to reimburse the directors and
officers of Tyco and its subsidiaries, including the Company and its
subsidiaries, for charges and expenses incurred by them for wrongful acts
claimed against them by reason of their being or having been directors or
officers of Tyco or any of its subsidiaries, including the Company and its
subsidiaries. Such insurance specifically excludes reimbursement of any director
or officer for any charge or expense incurred in connection with various
designated matters, including libel or slander, illegally obtained personal
profits, profits recovered by Tyco pursuant to Section 16(b) of the Exchange Act
and deliberate dishonesty.
 
ITEM 21. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
   
<TABLE>
<CAPTION>
 EXHIBIT NO.                                                   DESCRIPTION
- -----------------  ---------------------------------------------------------------------------------------------------
<C>                <S>
 
           3.1     --Memorandum of Association of Tyco (previously filed as an Exhibit to Tyco's Annual Report on Form
                     10-K for the year ended December 31, 1992)
 
           3.2     --Certificate of Incorporation on Change of Name of Tyco (previously filed as an Exhibit to Tyco's
                     Current Report on Form 8-K filed July 10, 1997)
 
           3.3     --Bye-Laws of Tyco (previously filed as Exhibit 3.3 to the Registrants' Form S-3 (File Nos.
                     333-50855 and 333-50855-01))
 
           3.4     --Articles of Association of the Company (previously filed as Exhibit 3.4 to the Registrants' Form
                     S-3 (File Nos. 333-50855 and 333-50855-01))
 
           4.1     --Indenture (previously filed as Exhibit 4.1 to the Registrants' Form S-3 (File Nos. 333-50855 and
                     333-50855-01))
 
           4.2     --Supplemental Indenture No. 5 with respect to the 5.875% Notes due 2004*
 
           4.3     --Supplemental Indenture No. 6 with respect to the 6.125% Notes due 2008*
 
           4.4     --Purchase Agreement, dated October 28, 1998, among the Company, Tyco as guarantor, and Lehman
                     Brothers Inc., J.P. Morgan Securities Inc., Credit Suisse First Boston Corporation and Donaldson,
                     Lufkin & Jenrette Securities Corporation*
 
           4.5     --Registration Rights Agreement, dated as of November 2, 1998, among the Company, Tyco as
                     guarantor, and Lehman Brothers Inc., J.P. Morgan Securities Inc., Credit Suisse First Boston
                     Corporation and Donaldson, Lufkin & Jenrette Securities Corporation*
 
           5.1     --Opinion of Appleby, Spurling & Kempe
</TABLE>
    
 
                                      II-1
<PAGE>
   
<TABLE>
<CAPTION>
 EXHIBIT NO.                                                   DESCRIPTION
- -----------------  ---------------------------------------------------------------------------------------------------
<C>                <S>
           5.2     --Opinion of Beghin Nothar Feider Loeff Claeys Verbeke
 
           5.3     --Opinion of Kramer Levin Naftalis & Frankel LLP
 
          12       --Statement of Computation of Ratio of Earnings to Fixed Charges
 
          23.1     --Consent of PricewaterhouseCoopers
 
          23.2     --Consent of Arthur Andersen LLP
 
          23.3     --Consent of Deloitte & Touche LLP
 
          24       --Powers of Attorney*
 
          25       --Statement of Eligibility of Trustee on Form T-1 (incorporated by reference to the Registrants'
                     Form S-3 (File Nos. 333-50855 and 333-50855-01))
 
          99.1     --Form of Letters of Transmittal
 
          99.2     --Form of Notices of Guaranteed Delivery
</TABLE>
    
 
- ------------------------
 
   
*   Previously filed.
    
 
ITEM 22. UNDERTAKINGS
 
    (a) The undersigned Registrant hereby undertakes:
 
   
        (1) To file, during any period in which offers or sales are being made,
    a post-effective amendment to this registration statement:
    
 
           (i) To include in any prospectus required by Section 10(a)(3) of the
       Securities Act of 1933;
 
   
           (ii) To reflect in the prospectus any facts or events arising after
       the effective date of this registration statement (or most recent
       post-effective amendment thereof) which, individually or in the
       aggregate, represent a fundamental change in the information set forth in
       this registration statement. Notwithstanding the foregoing, any increase
       or decrease in volume of securities offered (if the total dollar value of
       securities offered would not exceed that which was registered) and any
       deviation from the maximum aggregate offering price may be reflected in
       the form of prospectus filed with the SEC pursuant to Rule 424(b) under
       the Securities Act, if in the aggregate, the changes in volume and price
       represent no more than a 20% change in the maximum aggregate offering
       price set forth in the "Calculation of Registration Fee" table in the
       effective registration statement; and
    
 
   
           (iii) To include any material information with respect to the plan of
       distribution not previously disclosed in this registration statement or
       any material change to such information in this registration statement;
    
 
   
    provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
    the registration statement is on Form S-3, Form S-8 or Form F-3, and the
    information required to be included in a post-effective amendment by those
    paragraphs is contained in periodic reports filed or furnished to the
    Commission by the Registrant pursuant to Section 13 or 15(d) of the
    Securities and Exchange Act of 1934 that are incorporated by reference in
    the registration statement.
    
 
        (2) That, for purposes of determining any liability under the Securities
    Act of 1933, each such post-effective amendment shall be deemed to be a new
    registration statement relating to the securities offered therein, and the
    offering of such securities at that time shall be deemed to be the initial
    BONA FIDE offering thereof.
 
                                      II-2
<PAGE>
        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.
 
   
    (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities and Exchange
Act of 1934) that is incorporated by reference in the registration statement
shall be deemed to be a new registration statement relating to the securities
offered therein, and the offering of such securities at that time shall be
deemed to be the initial BONA FIDE offering thereof.
    
 
    (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant, pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and its, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
   
    (d) The undersigned Registrant hereby undertakes to respond to requests for
information that it incorporated by reference into the prospectus pursuant to
Item 4, 10(b), 11 or 13 of this form, within one business day of receipt of such
request, and to send the incorporated documents by first class mail or other
equally prompt means. This includes information contained in documents filed
subsequent to the effective date of the registration statement through the date
of responding to the request.
    
 
   
    (e) The undersigned Registrant hereby undertakes to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
    
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies and has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in the Town of Exeter,
State of New Hampshire, on the 23rd day of February, 1999.
    
 
   
<TABLE>
<S>                                      <C>        <C>
                                         TYCO INTERNATIONAL LTD.
 
                                         By:                      /s/ MARK H. SWARTZ
                                                    ----------------------------------------------
                                                                    Mark H. Swartz
                                                     EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL
                                                                        OFFICER
                                                     (PRINCIPAL FINANCIAL AND ACCOUNTING OFFICER)
</TABLE>
    
 
   
    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons on February 23,
1999 in the capacities indicated below.
    
 
          SIGNATURE                        TITLE
- ------------------------------  ---------------------------
                                Chairman of the Board,
              *                   President, Chief
- ------------------------------    Executive Officer and
     L. Dennis Kozlowski          Director (Principal
                                  Executive Officer)
 
              *                 Director
- ------------------------------
     Michael A. Ashcroft
 
              *                 Director
- ------------------------------
       Joshua M. Berman
 
              *                 Director
- ------------------------------
      Richard S. Bodman
 
              *                 Director
- ------------------------------
         John F. Fort
 
                                      II-4
<PAGE>
 
          SIGNATURE                        TITLE
- ------------------------------  ---------------------------
 
              *                 Director
- ------------------------------
       Stephen W. Foss
 
              *                 Director
- ------------------------------
     Richard A. Gilleland
 
              *                 Director
- ------------------------------
      Philip M. Hampton
 
              *                 Director
- ------------------------------
     James S. Pasman, Jr.
 
              *                 Director
- ------------------------------
       W. Peter Slusser
 
                                Executive Vice President
      /s/ MARK H. SWARTZ          and Chief Financial
- ------------------------------    Officer (Principal
        Mark H. Swartz            Financial and Accounting
                                  Officer)
 
              *                 Director
- ------------------------------
     Frank E. Walsh, Jr.
 
   
<TABLE>
<S>   <C>                        <C>                         <C>
*By:     /s/ MARK H. SWARTZ
      -------------------------
           Mark H. Swartz
          ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-5
<PAGE>
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies and has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in Luxembourg, on the 23rd
day of February, 1999.
    
 
                                TYCO INTERNATIONAL GROUP S.A.
 
                                BY:             /S/ RICHARD W. BRANN
                                     -----------------------------------------
                                                  Richard W. Brann
                                                 MANAGING DIRECTOR
                                                (PRINCIPAL FINANCIAL
                                              AND ACCOUNTING OFFICER)
 
   
    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons on February 23,
1999 in the capacities indicated below.
    
 
          SIGNATURE                        TITLE
- ------------------------------  ---------------------------
              *                 Director
- ------------------------------
        Philippe Beot
 
     /s/ RICHARD W. BRANN       Managing Director
- ------------------------------
       Richard W. Brann
 
              *                 Managing Director
- ------------------------------
        Erik D. Lazar
 
   
<TABLE>
<S>   <C>                        <C>                         <C>
*By:    /s/ RICHARD W. BRANN
      -------------------------
          Richard W. Brann
          ATTORNEY-IN-FACT
</TABLE>
    
 
                                      II-6
<PAGE>
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                            DESCRIPTION                                             PAGE NUMBER
- -----------  ------------------------------------------------------------------------------------------  -----------------
<C>          <S>                                                                                         <C>
 
       3.1   --Memorandum of Association of Tyco (previously filed as an Exhibit to Tyco's Annual
               Report on Form 10-K for the year ended December 31, 1992)...............................
 
       3.2   --Certificate of Incorporation on Change of Name of Tyco (previously filed as an Exhibit
               to Tyco's Current Report on Form 8-K filed July 10, 1997)...............................
 
       3.3   --Bye-Laws of Tyco (previously filed as Exhibit 3.3 to the Registrants' Form S-3 (File
               Nos. 333-50855 and 333-50855-01)).......................................................
 
       3.4   --Articles of Association of the Company (previously filed as Exhibit 3.4 to the
               Registrants' Form S-3 (File Nos. 333-50855 and 333-50855-01))...........................
 
       4.1   --Indenture (previously filed as Exhibit 4.1 to the Registrants' Form S-3 (File Nos.
               333-50855 and 333-50855-01))............................................................
 
       4.2   --Supplemental Indenture No. 5 with respect to the 5.875% Notes due 2004*.................
 
       4.3   --Supplemental Indenture No. 6 with respect to the 6.125% Notes due 2008*.................
 
       4.4   --Purchase Agreement, dated October 28, 1998, among the Company, Tyco as guarantor, and
               Lehman Brothers Inc., J.P. Morgan Securities Inc., Credit Suisse First Boston
               Corporation and Donaldson, Lufkin & Jenrette Securities Corporation*....................
 
       4.5   --Registration Rights Agreement, dated as of November 2, 1998, among the Company, Tyco as
               guarantor, and Lehman Brothers Inc., J.P. Morgan Securities Inc., Credit Suisse First
               Boston Corporation and Donaldson, Lufkin & Jenrette Securities Corporation*.............
 
       5.1   --Opinion of Appleby, Spurling & Kempe....................................................
 
       5.2   --Opinion of Beghin Nothar Feider Loeff Claeys Verbeke....................................
 
       5.3   --Opinion of Kramer Levin Naftalis & Frankel LLP..........................................
 
      12     --Statement of Computation of Ratio of Earnings to Fixed Charges..........................
 
      23.1   --Consent of PricewaterhouseCoopers.......................................................
 
      23.2   --Consent of Arthur Andersen LLP..........................................................
 
      23.3   --Consent of Deloitte & Touche LLP........................................................
 
      24     --Powers of Attorney*.....................................................................
 
      25     --Statement of Eligibility of Trustee on Form T-1 (incorporated by reference to the
               Registrants' Form S-3, (File Nos. 333-50855 and 333-50855-01))..........................
 
      99.1   --Form of Letters of Transmittal..........................................................
 
      99.2   --Form of Notices of Guaranteed Delivery..................................................
</TABLE>
    
 
- ------------------------
 
   
*   Previously filed.
    

<PAGE>
                                                                     EXHIBIT 5.1
 
                                                               23 February, 1999
 
Tyco International Ltd.
The Gibbons Building
10 Queen Street
Hamilton HM 11
 
Dear Sirs
 
TYCO INTERNATIONAL LTD. ("TYCO")
 
    We have acted as Bermuda counsel to Tyco in connection with the Registration
Statement on Form S-4, as amended (File Nos. 333-71493 and 333-71493-01) (the
"Registration Statement") filed by Tyco and Tyco International Group S.A., a
Luxembourg company (the "Issuer") with the United States Securities and Exchange
Commission (the "Commission") under the Securities Act of 1933, as amended, for
the registration of $400,000,000 aggregate principal amount of the Issuer's
5.875% Notes due 2004 and $400,000,000 aggregate principal amount of the
Issuer's 6.125% Notes due 2008 (the "Debt Securities") and the guarantees (the
"Guarantees") of the Debt Securities by Tyco, to be issued upon consummation of
the exchange offer referred to in the Registration Statement (the "Exchange
Offer"). The Debt Securities are in two series pursuant to an Indenture filed as
Exhibit 4.1 to the Registration Statement (the "Indenture") among the Issuer,
Tyco (as Guarantor) and the trustee thereunder.
 
    For the purposes of this opinion we have examined and relied upon the
following documents:
 
DOCUMENTS
 
    (i) The Registration Statement;
 
    (ii) the Indenture, Supplemental Indenture No. 5 to the Indenture filed as
         Exhibit 4.2 to the Registration Statement and Supplemental Indenture
         No. 6 to the Indenture filed as Exhibit 4.3 to the Registration
         Statement, pursuant to which the Debt Securities will be issued;
 
   (iii) the Registration Rights Agreement filed as Exhibit 4.5 to the
         Registration Statement;
 
    (iv) a copy of the Certificate of Mark H. Swartz, Executive Vice President
         of Tyco dated November 2, 1998 as to the resolutions of the Board of
         Directors of Tyco, passed on October 21, 1998 (the "Tyco Board
         Resolutions");
 
    (v) a copy of the Certificate of Byron S. Kalogerou, Managing Director of
        the Issuer, dated November 2, 1998, as to the resolutions of the Board
        of Directors of the Issuer passed on October 28, 1998 (the "Issuer's
        Board Resolutions");
 
    (vi) the entries and filings shown in respect of Tyco on the file of Tyco
         maintained in the Register of Companies at the office of the Registrar
         of Companies in Hamilton, Bermuda, as revealed by a search done on
         9(th) February, 1999;
 
   (vii) the entries and filings shown in the Supreme Court Causes Book
         maintained at the Registry of the Supreme Court in Hamilton, Bermuda,
         as revealed by a search done on 9(th) February, 1999 in respect of
         Tyco;
 
       the searches referred to in items (vi) and (vii) above are together
       referred to as the "Searches"; and
 
  (viii) certified copies of the Certificate of Incorporation, Memorandum of
         Association and Bye-laws of the Company (collectively referred to as
         the "Constitutional Documents").
<PAGE>
ASSUMPTIONS
 
    In stating our opinion we have assumed:-
 
    (a) the authenticity, accuracy and completeness of all documents submitted
        to us as originals and the conformity to authentic original documents of
        all documents submitted to us as certified, conformed, notarised or
        photostatic copies;
 
    (b) the genuineness of all signatures on the documents we have reviewed;
 
    (c) the authority, capacity and power of each of the persons, other than
        Tyco, signing the documents which we have reviewed;
 
    (d) that any factual statements made in the Registration Statement, any of
        the exhibits thereto and any certificates examined by us are true,
        accurate and complete in all respects material to this opinion;
 
    (e) that there are no provisions of the laws or regulations of any
        jurisdiction other than Bermuda which would be contravened by the
        execution or delivery of the Guarantees or which would have any
        implication in relation to the opinion expressed herein and that, in so
        far as any obligation under, or action to be taken under, the Guarantees
        is required to be performed or taken in any jurisdiction outside
        Bermuda, the performance of such obligation or the taking of such action
        will constitute a valid and binding obligation of each of the parties
        thereto under the laws of that jurisdiction and will not be illegal by
        virtue of the laws of that jurisdiction;
 
    (f) that the records which were the subject of the Searches were complete
        and accurate at the date of such Searches and disclosed all information
        which is material for the purposes of this opinion and such information
        has not since such date been materially altered;
 
    (g) that the Tyco Board Resolutions and the Issuer's Board Resolutions are
        in full force and effect and have not been rescinded, either in whole or
        in part, and accurately record the resolutions passed by the respective
        Board of Directors of Tyco and the Issuer in meetings which were duly
        convened and at which a duly constituted quorum was present and voting
        throughout;
 
    (h) that each Director of Tyco and the Issuer, when the Board of Directors
        of Tyco and the Issuer passed the Tyco Board Resolutions and the
        Issuer's Board Resolutions respectively, discharged his fiduciary duty
        owed to Tyco or the Issuer respectively and acted honestly and in good
        faith with a view to the respective best interests of Tyco or the
        Issuer;
 
    (i) that Tyco has entered into its obligations under the Guarantees in good
        faith for the purpose of carrying on its business and that, at the time
        it did so, there were reasonable grounds for believing that the
        transactions contemplated by the Guarantees would benefit Tyco; and
 
    (j) that the Registration Rights Agreement, the Indenture and the
        Supplemental Indentures constitute legal, valid and binding obligations
        of each of the parties thereto, enforceable in accordance with their
        terms, under the laws of the State of New York by which they are
        expressed to be governed.
 
OPINION
 
    Based upon and subject to the foregoing and subject to the reservations set
out below and to any matters not disclosed to us, we are of the opinion that:-
 
    (1) Tyco is an exempted company incorporated with limited liability and
        existing under the laws of Bermuda. Tyco is in good standing under the
        laws of Bermuda.
 
                                       2
<PAGE>
    (2) All necessary corporate action required to be taken pursuant to Bermuda
        law by Tyco in connection with the issue by Tyco of the Guarantees in
        accordance with the provisions of the Indenture and the applicable
        Supplemental Indentures and upon the terms of the Exchange Offer set
        forth in the Registration Statement has been taken by or on behalf of
        Tyco.
 
    (3) There are no taxes, duties or other charges payable to or chargeable by
        the Government of Bermuda, or any authority or agency thereof in respect
        of the issue of the Guarantees.
 
RESERVATIONS
 
    We have the following reservations:-
 
    (a) We express no opinion as to any law other than Bermuda law and none of
        the opinions expressed herein relates to compliance with or matters
        governed by the laws of any jurisdiction except Bermuda. This opinion is
        limited to Bermuda law as applied by the Courts of Bermuda at the date
        hereof.
 
    (b) In paragraph (1) above, the term "good standing" means that Tyco has
        neither failed to make any filing with any Bermuda governmental
        authority nor to pay any Bermuda government fee or tax, which might make
        it liable to be struck off the Registrar of Companies and thereby cease
        to exist under the laws of Bermuda.
 
DISCLOSURE
 
    This opinion is addressed to you solely for your benefit and is neither to
be transmitted to any other person, nor relied upon by any other person or for
any other purpose nor quoted or referred to in any public document nor filed
with any governmental agency or person, without our prior written consent,
except as may be required by law or regulatory authority. Further, this opinion
speaks as of its date and is strictly limited to the matters stated herein.
 
    We hereby consent to the inclusion of the opinion as an exhibit to the
Registration Statement and the references to our Firm under the caption "Legal
Matters" in the prospectus included as part of the Registration Statement.
 
    This opinion is governed by and is to be construed in accordance with
Bermuda law. It is given on the basis that it will not give rise to any legal
proceedings with respect thereto in any jurisdiction other than Bermuda.
 
Yours faithfully
 
/s/ Appleby, Spurling & Kempe
 
                                       3

<PAGE>
                                                                     EXHIBIT 5.2
 
<TABLE>
<S>                                                                     <C>                <C>
BEGHIN NOTHAR FEIDER                                                              ADRESSE  58, rue Charles Martel
LOEFF CLAEYS VERBEKE                                                                       L-2134 LUXEMBOURG
AVOCATS ASSOCIES
                                                                          ADRESSE POSTALE  Boite Postale 5017
                                                                                           L-1050 LUXEMBOURG
                                                                                TELEPHONE  +352 44 44 55-1
                                                                                      FAX  +352 44 44 55-222
                                                                                   E-MAIL  [email protected]
                                                                            AVOCATS AN LA  Paul Beghin
                                                                                     COUR  Roger Nothar
                                                                                           Marc Feider
                                                                                           Andre Marc
                                                                                           Henri Wagner
                                                                                           Jean Schaffner
                                                                                           Pierre Schleimer
                                                                                           Katira Manhaeve
                                                                                           Eric Fousseaux
                                                                                           Sandrine Conin
 Tyco International Group S.A.                                                             Anne Roth
 6, Avenue Emile Reuter                                                                    Claude Werer
 L-2420 Luxembourg                                                                         Jean-Pierre Klein
</TABLE>
 
                                                   Luxembourg, February 23, 1999
 
Dear Sirs,
 
                         TYCO INTERNATIONAL GROUP S.A.
(INCORPORATED AS A SOCIETE ANONYME WITH LIMITED LIABILITY UNDER THE LAWS OF THE
                           GRAND-DUCHY OF LUXEMBOURG)
              OFFER TO EXCHANGE $400,000,000 5.875% NOTES DUE 2004
                                      AND
              OFFER TO EXCHANGE $400,000,000 6.125% NOTES DUE 2008
 
    We have acted as legal advisers in the Grand-Duchy of Luxembourg
("Luxembourg") to Tyco International Group S.A. (the "Issuer"), a limited
liability company (SOCIETE ANONYME) now organized under the laws of Luxembourg
but formerly a company named "Velum Limited" organized under the laws of
Gibraltar which transferred its registered and principal office to Luxembourg on
March 30, 1998. We are giving this opinion in connection with the filing by Tyco
International Ltd., a Bermuda company ("Tyco") and the Issuer, with the United
States Securities and Exchange Commission, of Amendment No. 1 to Form S-4
Registration Statement (Registration Nos. 333-71493 and 333-71493-01) (the
"Registration Statement") with respect to the Issuer's offer to exchange up to
$400,000,000 5.875% Notes due 2004 for any and all outstanding 5.875% Notes due
2004 and up to $400,000,000 6.125% Notes due 2008 for any and all outstanding
6.125% Notes due 2008 (the new notes of each series being the "Debt
Securities").
 
    We have examined copies of the following documents:
 
       (a) the Registration Statement;
 
       (b) the minutes of the extraordinary general meeting of shareholders of
           the Issuer held in notarial form before the notary Jean-Joseph Wagner
           on March 30, 1998;
 
       (c) the restated articles of association of the Issuer in a version,
           dated March 30, 1998, published in the Official Gazette (Memorial)
          C-N DEG. 474 of 29th June 1998, as amendment to the articles of
           association of the Issuer by way of a notarial deed dated July 6,
           1998 and published in the Official Gazette (Memorial) C-N DEG. 733 of
           October 10, 1998, and an
<PAGE>
           amendment to the articles of association of the Issuer by way of a
           notarial deed dated October 22, 1998, not yet published, and an
           amendment to the articles of association of the Issuer by way of a
           notarial deed dated December 4, 1998, not yet published;
 
       (d) an excerpt from the trade and company register at the district court
           in Luxembourg;
 
       (e) the minutes of a meeting of the board of directors of the Issuer
           dated October 28, 1998 resolving INTER ALIA the issue of the Debt
           Securities, the entry into any and all contractual documents in
           connection therewith (the "Agreements") and the filing of the
           Registration Statement; and
 
       (f) all other relevant corporate documents of the Issuer and such further
           documents and matters of law as we have considered necessary or
           appropriate for the rendering of this opinion.
 
    For the purposes of this opinion, we have assumed with your consent, and we
have not verified independently, the following:
 
       i.  the genuineness of all the signatures and documents submitted to us
           as originals and the conformity to the originals thereof of all
           documents in respect of the Debt Securities submitted to us as copies
           or specimens;
 
       ii.  the due authorization, execution and delivery of all documents in
           respect of the Debt Securities by all the parties thereto (other than
           the Issuer), as well as the power, authority and legal right of all
           the parties thereto (other than the Issuer) to enter into, execute,
           deliver and perform their respective obligations thereunder, and
           compliance with all applicable laws and regulations, other than
           Luxembourg law;
 
       iii. that all authorizations and consents of any country other than
           Luxembourg which may be required in connection with the execution,
           delivery and performance of the Agreements and other documents,
           including the Registration Statement, in respect of the issue of the
           Debt Securities have been or will be obtained;
 
       iv.  the validity and enforceability of the Agreements and other
           documents in respect of the Debt Securities under their governing
           laws (other than the laws of Luxembourg);
 
       v.  that the articles of association of the Issuer have not been amended
           since December 4, 1998;
 
       vi.  that the Debt Securities will not be the subject of a public
           offering in Luxembourg, unless the relevant requirements of
           Luxembourg law concerning public offerings of securities have been
           fulfilled; and
 
       vii. that there are no provisions of the laws of any jurisdiction outside
           Luxembourg which would have any negative impact on the opinions we
           express in this legal opinion.
 
    Subject to the assumptions made above and the qualifications set forth
below, we are of the opinion as at the date hereof that:
 
       1.  The Issuer is a limited liability company validly organized and
           existing under the laws of Luxembourg and has all requisite corporate
           power and authority to issue the Debt Securities.
 
       2.  All necessary action required to be taken by the Issuer pursuant to
           the laws of Luxembourg has been taken by or on behalf of the Issuer
           and all the necessary authorizations and approvals of government
           authorities in Luxembourg have been duly obtained for the issue by
           the Issuer of the Debt Securities.
 
       3.  No filing with, or authorization, approval, consent, license, order
           registration, qualification or decree of, any court or governmental
           authority or agency in Luxembourg is necessary
<PAGE>
           or required to be made or obtained by Tyco or the Issuer in
           connection with the issue by the Issuer of the Debt Securities.
 
       4.  There are no taxes, duties, or other charges payable to or chargeable
           by the Government of Luxembourg, or any authority or agency thereof,
           in respect of the issue by the Issuer of the Debt Securities.
 
    The above opinions are subject to the following qualifications:
 
       a)  Although this is rarely done in practice, if any or all Agreements or
           the Registration Statement were produced in Luxembourg proceedings or
           in front of a Luxembourg official authority, the court could order
           the registration thereof, in which case an AD VALOREM tax would be
           payable at the rate of 0.24 per cent., unless production was made in
           an enforceability claim under the provisions of the European
           Convention of Jurisdiction and Enforcement of Judgments in Civil and
           Commercial matters signed at Brussels on 27th September, 1968, as
           amended.
 
       b)  This opinion is limited to matters of Luxembourg law only and we
           express no opinion other than with respect to Luxembourg law under
           the assumptions and reservations made hereunder.
 
       c)  This opinion is as of this date and we undertake no obligation to
           update it or advise of changes hereafter occurring. We express no
           opinion as to any matters other than those expressly set forth
           herein, and no opinion is, or may be, implied or inferred herefrom.
 
    It should be noted that there are always irreconcilable differences between
languages making it impossible to guarantee a totally accurate translation or
interpretation. In particular, there are always some legal concepts which exist
in one jurisdiction and not in another, and in those cases it is bound to be
difficult to provide a completely satisfactory translation or interpretation
because the vocabulary is missing from the language. We accept no responsibility
for omissions or inaccuracies to the extent that any are attributable to such
factors.
 
    This opinion shall be construed in accordance with Luxembourg law and
Luxembourg legal concepts are expressed in English terms and not in their
original French terms. The concepts concerned may not be identical to the
concepts described by the same English terms as they exist under the laws of
other jurisdictions.
 
    This opinion, may, therefore, only be relied upon under the express
condition that any issues of interpretation arising thereunder will be governed
by Luxembourg law and be brought before a Luxembourg court. Nothing in this
opinion should be taken as expressing an opinion in respect of any
representations or warranties, or other information, contained in the Prospectus
included in the Registration Statement or any other document examined in
connection with the opinion except as expressly confirmed herein.
 
    We hereby consent to the inclusion of the opinion as an exhibit to the
Registration Statement. We also consent to the reference to our firm under the
caption "Legal Matters" in the Prospectus included as part of the Registration
Statement.
 
Yours faithfully,
 
BEGHIN NOTHAR FEIDER
 
LOEFF CLAEYS VERBEKE
 
by:  /s/ Marc Feider
- ------------------------------------
    Marc Feider

<PAGE>
                                                                     EXHIBIT 5.3
 
              [LETTERHEAD OF KRAMER LEVIN NAFTALIS & FRANKEL LLP]
 
                                                               February 23, 1999
 
Tyco International Ltd.
The Gibbons Building
10 Queen Street, Suite 301
Hamilton HM11 Bermuda
 
Tyco International Group S.A.
6, avenue Emile Reuter
Second Floor
L - 2420 Luxembourg
 
Ladies and Gentlemen:
 
    We have acted as United States securities counsel for Tyco International
Ltd., a Bermuda company ("Tyco"), and Tyco International Group S.A., a
Luxembourg company (the "Issuer"), in connection with the Registration Statement
on Form S-4, as amended (File Nos. 333-71493 and 333-71493-01) (the
"Registration Statement") filed by Tyco and the Issuer with the United States
Securities and Exchange Commission (the "Commission") under the Securities Act
of 1933, as amended, for the registration of $400,000,000 aggregate principal
amount of the Issuer's 5.875% Notes due 2004 and $400,000,000 aggregate
principal amount of the Issuer's 6.125% Notes due 2008 (the "Debt Securities")
and the guarantees (the "Guarantees") of the Debt Securities by Tyco, to be
issued upon consummation of the exchange offer referred to in the Registration
Statement (the "Exchange Offer"). The Debt Securities are in two series pursuant
to an Indenture filed as Exhibit 4.1 to the Registration Statement (the
"Indenture") among the Issuer, Tyco (as Guarantor) and the trustee thereunder.
 
    We have examined (i) the Registration Statement; (ii) the Indenture,
Supplemental Indenture No. 5 to the Indenture filed as Exhibit 4.2 to the
Registration Statement and Supplemental Indenture No. 6 to the Indenture filed
as Exhibit 4.3 to the Registration Statement, pursuant to which the Debt
Securities will be issued; (iii) the Registration Rights Agreement filed as
Exhibit 4.5 to the Registration Statement; and (iv) originals, photocopies or
conformed copies of all such records of Tyco, the Issuer and their subsidiaries,
all such agreements and certificates of public officials, and such other
documents as we have deemed relevant and necessary as a basis for the opinion
hereinafter expressed. In addition, we have examined and relied upon the
opinions of Appleby, Spurling & Kempe, Bermuda counsel to Tyco, and Beghin
Nothar Feider Loeff Claeys Verbeke, Luxembourg counsel to the Issuer, of even
date.
 
    Based upon and subject to the foregoing, we are of the opinion that:
 
    With respect to the Debt Securities, when such Debt Securities have been
duly executed, authenticated, issued and delivered in accordance with the
provisions of the Indenture, and the applicable supplemental indentures, and
upon the terms of the Exchange Offer set forth in the Registration Statement,
the Debt Securities will be legally issued and will constitute valid and binding
obligations of the Issuer, enforceable against the Issuer in accordance with
their terms, except as such enforcement is subject to any applicable bankruptcy,
insolvency, reorganization, moratorium, fraudulent conveyance or other law
relating to or affecting creditors' rights and remedies generally and general
principles of equity.
<PAGE>
    With respect to the Guarantees, when the Guarantees have been duly executed,
authenticated, issued and delivered in accordance with the provisions of the
Indenture and the applicable supplemental indentures, and upon the terms of the
Exchange Offer set forth in the Registration Statement, the Guarantees will be
legally issued and will constitute valid and binding obligations of Tyco,
enforceable against Tyco in accordance with their terms, except as such
enforcement is subject to any applicable bankruptcy, insolvency, reorganization,
moratorium, fraudulent conveyance or other law relating to or affecting
creditors' rights and remedies generally and general principles of equity.
 
    Please be advised, Joshua M. Berman, a director and Vice President of Tyco,
is counsel to our firm.
 
    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the statements made with respect to us under the
caption "Legal Matters" in the prospectus included as part of the Registration
Statement.
 
    We call your attention to the fact that we are admitted to practice law only
in the State of New York and, in rendering the foregoing opinion, we do not
express an opinion concerning any laws other than the laws of the State of New
York and the federal laws of the United States of America.
 
                                          Very truly yours,
                                          /s/ Kramer Levin Naftalis & Frankel
                                          LLP

<PAGE>
                                                                      EXHIBIT 12
 
                             TYCO INTERNATIONAL LTD
              COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES(1)
                                ($ IN MILLIONS)
 
   
<TABLE>
<CAPTION>
                                             THREE MONTHS    YEAR     NINE MONTHS
                                                ENDED        ENDED       ENDED          YEAR ENDED DECEMBER 31,
                                             DECEMBER 31,  SEPT. 30,   SEPT. 30,    -------------------------------
                                                 1998       1998(5)     1997(5)       1996       1995       1994
                                             ------------  ---------  ------------  ---------  ---------  ---------
<S>                                          <C>           <C>        <C>           <C>        <C>        <C>
Earnings:
Income (loss) before extraordinary item....   $    (26.0)  $   965.1   $   (697.7)  $  (187.6) $   346.7  $   324.0
Income taxes...............................         68.2       428.9        208.1       268.1      219.2      206.7
                                             ------------  ---------  ------------  ---------  ---------  ---------
                                                    42.2     1,394.0       (489.6)       80.5      565.9      530.7
                                             ------------  ---------  ------------  ---------  ---------  ---------
Fixed Charges:
Interest expense(2)........................        103.3       270.1        144.8       207.3      210.2      185.4
Rentals(3).................................         20.6        82.2         60.8        72.9       61.6       55.2
                                             ------------  ---------  ------------  ---------  ---------  ---------
                                                   123.9       352.3        205.6       280.2      271.8      240.6
                                             ------------  ---------  ------------  ---------  ---------  ---------
Earnings (loss) before income taxes and
  fixed charges............................   $    166.1   $ 1,746.3   $   (284.0)  $   360.7  $   837.7  $   771.3
                                             ------------  ---------  ------------  ---------  ---------  ---------
                                             ------------  ---------  ------------  ---------  ---------  ---------
 
Ratio of earnings to fixed charges(4)......         1.34(4)      4.96          (4)       1.29(4)      3.08      3.21
</TABLE>
    
 
- ------------------------
 
   
(1) On July 2, 1997, Tyco, formerly called ADT Limited, merged with Tyco
    International Ltd., a Massachusetts corporation ("Former Tyco"). On August
    27, 1997, Tyco consummated a merger with INBRAND Corporation; on August 29,
    1997, Tyco consummated a merger with Keystone International, Inc.; and on
    October 1, 1998, Tyco consummated a merger with United States Surgical
    Corporaion. Each of the four merger transactions qualifies for the pooling
    of interests method of accounting. As such, the ratios of earnings to fixed
    charges presented above include the effect of the mergers, except that the
    calculation presented above for periods prior to January 1, 1997 does not
    include INBRAND due to immateriality.
    
 
   
   Prior to their respective mergers, ADT, Keystone and US Surgical had December
    31 year ends and Former Tyco had a June 30 fiscal year end. The historical
    results upon which the ratios are based have been combined using a December
    31 year end for ADT, Keystone, Former Tyco and US Surgical for the year
    ended December 31, 1996. For 1995 and 1994, the ratio of earnings to fixed
    charges reflects the combination of ADT, Keystone and US Surgical with a
    December 31 year end and Former Tyco with a June 30 fiscal year end.
    
 
(2) Interest expense consists of interest on indebtedness and amortization of
    debt expense.
 
(3) One-third of net rental expense is deemed representative of the interest
    factor.
 
(4) Earnings were insufficient to cover fixed charges by $489.6 million in the
    nine months ended September 30, 1997.
 
   
   Earnings for the three months ended December 31, 1998, the nine months ended
    September 30, 1997 and the year ended December 31, 1996 include merger,
    restructuring and other non-recurring charges of $434.9 million, $947.9
    million and $246.1 million, respectively. Earnings also include a charge for
    the impairment of long-lived assets of $76.0 million, $148.4 million and
    $744.7 million, respectively, in the three months ended December 31, 1998,
    the nine months ended September 30, 1997 and the year ended December 31,
    1996. The 1997 period also includes a write-off of purchased in-process
    research and development of $361.0 million.
    
 
   
   On a pro forma basis, the ratio of earnings to fixed charges excluding
    merger, restructuring and other non-recurring charges, charge for the
    impairment of long-lived assets and write-off of purchased in-process
    research and development would have been 5.46x, 5.71x and 4.82x for the
    three
    
<PAGE>
   
    months ended December 31, 1998, the nine months ended September 30, 1997 and
    the year ended December 31, 1996, respectively.
    
 
(5) In September 1997, Tyco changed its fiscal year end from December 31 to
    September 30. Accordingly, the nine month transition period ended September
    30, 1997 and the fiscal year ended September 30, 1998 are presented.

<PAGE>
                                                                    EXHIBIT 23.1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
    We consent to the incorporation by reference in this Amendment No. 1 to the
Registration Statement on Form S-4 of Tyco International Ltd. and Tyco
International Group S.A. (File Nos. 333-71493 and 333-71493-01) of our report
dated November 23, 1998, on our audit of the combination of the historical
consolidated financial statements and consolidated financial statement schedule
of Tyco International Ltd. and United States Surgical Corporation, after
restatement for the pooling of interests as described in Note 1 to the
consolidated financial statements, which report is included in Tyco's Current
Report on Form 8-K filed December 10, 1998. We also consent to the reference to
our firm under the caption "Experts."
    
 
                                          /s/ PRICEWATERHOUSECOOPERS
 
   
Hamilton, Bermuda
February 23, 1999
    

<PAGE>
                                                                    EXHIBIT 23.2
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
   
    As independent public accountants, we hereby consent to the incorporation by
reference in this Amendment No. 1 to Registration Statement on Form S-4 of Tyco
International Ltd. and Tyco International Group S.A. (File Nos. 333-71493 and
333-71493-01) of our report dated January 31, 1997 on our audit of the
consolidated statements of income, changes in shareholders' investment and cash
flows of Keystone International, Inc. and subsidiaries for the year ended
December 31, 1996, included in the Tyco International Ltd. Current Report on
Form 8-K filed December 10, 1998, and to all references to our Firm included in
this Registration Statement.
    
 
                                           /s/ ARTHUR ANDERSEN LLP
 
   
Houston, Texas
February 23, 1999
    

<PAGE>
                                                                    EXHIBIT 23.3
 
                         INDEPENDENT AUDITORS' CONSENT
 
   
    We consent to the incorporation by reference in this Amendment No. 1 to
Registration Statement (File Nos. 333-71493 and 333-71493-01) on Form S-4 of
Tyco International Ltd. and Tyco International Group S.A. of our report dated
September 30, 1998 (relating to the consolidated balance sheet of United States
Surgical Corporation and its subsidiaries as of September 30, 1997, and the
consolidated statements of operations, changes in stockholders' equity and cash
flows for the nine month period ended September 30, 1997, the twelve month
period ended December 31, 1996 and the related financial statement schedule for
the nine month period ended September 30, 1997 and the twelve month period ended
December 31, 1996), which report is included in Tyco International Ltd.'s
Current Report on Form 8-K filed December 10, 1998, and to the reference to us
under the heading "Experts" in the Prospectus, which is part of this
Registration Statement.
    
 
                                          /s/ DELOITTE & TOUCHE LLP
 
   
Stamford, Connecticut
February 23, 1999
    

<PAGE>
                             LETTER OF TRANSMITTAL
 
                         TYCO INTERNATIONAL GROUP S.A.
                            TYCO INTERNATIONAL LTD.
                               OFFER TO EXCHANGE
                             5.875% NOTES DUE 2004
                                      FOR
                             5.875% NOTES DUE 2004
 
              PURSUANT TO THE PROSPECTUS DATED FEBRUARY    , 1999
 
- --------------------------------------------------------------------------------
    THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON MARCH
   , 1999, UNLESS THE EXCHANGE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------
 
                 The Exchange Agent for the Exchange Offer is:
                              The Bank of New York
 
<TABLE>
<S>                               <C>                               <C>
 BY HAND OR OVERNIGHT DELIVERY:       FACSIMILE TRANSACTIONS:       BY REGISTERED OR CERTIFIED MAIL:
                                    (Eligible Institutions Only)
      The Bank of New York                 (212) 815-4699                 The Bank of New York
     101 Barclay Street, 7E           TO CONFIRM BY TELEPHONE              101 Barclay Street
    New York, New York 10286          OR FOR INFORMATION CALL:      Corporate Trust Services Window
     Attn: Denise Robinson                 (212) 815-2791                     Ground Level
                                                                        New York, New York 10286
                                                                         Attn: Denise Robinson
</TABLE>
 
- --------------------------------------------------------------------------------
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OR TRANSMISSION TO A FACSIMILE
NUMBER OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID DELIVERY. THE
   METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING CERTIFICATES, IS AT THE RISK
   OF THE HOLDER. IF DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT
   REQUESTED, PROPERLY INSURED, IS RECOMMENDED. YOU SHOULD READ THE
   INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL CAREFULLY BEFORE YOU
   COMPLETE THIS LETTER OF TRANSMITTAL.
 
    The undersigned acknowledges that he or she has received the prospectus,
dated February    , 1999 (the "Prospectus"), of Tyco International Group S.A., a
Luxembourg company (the "Company"), and Tyco International Ltd., a Bermuda
company ("Tyco"), and this Letter of Transmittal and the instructions hereto
(the "Letter of Transmittal"), which together constitute the Company's offer
(the "Exchange Offer") to exchange $1,000 principal amount of its 5.875% Notes
due 2004 (the "Exchange Notes"), which have been registered under the Securities
Act of 1933, as amended (the "Securities Act"), pursuant to a Registration
Statement of which the Prospectus is a part, for each $1,000 principal amount of
its outstanding 5.875% Notes due 2004 (the "Restricted Notes"), of which
$400,000,000 aggregate principal amount is outstanding, upon the terms and
subject to the conditions set forth in the Prospectus. The term "Expiration
Date" shall mean 5:00 p.m. New York City time on March    , 1999, unless the
Company, in its sole discretion, extends the Exchange Offer, in which case the
term shall mean the latest date and time to which the Exchange Offer is extended
by the Company. Capitalized terms used but not defined herein have the meaning
given to them in the Prospectus.
 
    This Letter of Transmittal is to be used if either (1) certificates
representing Restricted Notes are to be physically delivered to the Exchange
Agent herewith by Holders (as defined below) or (2) tender of Restricted Notes
is to be made by Holders according to the guaranteed delivery procedures set
forth in the Prospectus under "Exchange Offer--Guaranteed Delivery Procedures."
Delivery of this Letter of Transmittal and any other required documents must be
made to the Exchange Agent.
 
    DELIVERY OF DOCUMENTS TO DTC IN ACCORDANCE WITH DTC'S PROCEDURES DOES NOT
CONSTITUTE DELIVERY TO THE EXCHANGE AGENT.
<PAGE>
    The term "Holder" as used herein means any person in whose name Restricted
Notes are registered on the books of the Company or any other person who has
obtained a properly completed bond power from the registered holder.
 
    All Holders of Restricted Notes who wish to tender their Restricted Notes
must, prior to the Expiration Date either: (a) complete, sign and deliver this
Letter of Transmittal, or a facsimile thereof, to the Exchange Agent, in person
or to the address or facsimile number set forth above and tender (and not
withdraw) his, her or its Restricted Notes or, (b) if a tender of Restricted
Notes is to be made by book-entry transfer to the account maintained by the
Exchange Agent at DTC, confirm such book-entry transfer, including the delivery
of an Agent's Message (a "Book-Entry Confirmation"), in each case in accordance
with the procedures for tendering described in the Instructions to this Letter
of Transmittal. Holders of Restricted Notes whose certificates are not
immediately available, or who are unable to deliver their certificates or
Book-Entry Confirmation and all other documents required by this Letter of
Transmittal to be delivered to the Exchange Agent on or prior to the Expiration
Date, must tender their Restricted Notes according to the guaranteed delivery
procedures set forth under the caption "Exchange Offer--Guaranteed Delivery
Procedures" in the Prospectus. (See Instruction 2.)
 
    Upon the terms and subject to the conditions of the Exchange Offer, the
acceptance for exchange of the Restricted Notes validly tendered and not
withdrawn and the issuance of the Exchange Notes will be made promptly following
the Expiration Date. For the purposes of the Exchange Offer, the Company shall
be deemed to have accepted for exchange validly tendered Restricted Notes when,
as and if the Company has given written notice thereof to the Exchange Agent.
 
    The undersigned has completed, executed and delivered this Letter of
Transmittal to indicate the action the undersigned desires to take with respect
to the Exchange Offer.
 
    PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS CAREFULLY
BEFORE CHECKING ANY BOX BELOW. THE INSTRUCTIONS INCLUDED IN THIS LETTER OF
TRANSMITTAL MUST BE FOLLOWED. QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR
ADDITIONAL COPIES OF THE PROSPECTUS, THIS LETTER OF TRANSMITTAL AND THE NOTICE
OF GUARANTEED DELIVERY MAY BE DIRECTED TO THE EXCHANGE AGENT. SEE INSTRUCTION
12.
 
    HOLDERS WHO WISH TO ACCEPT THE EXCHANGE OFFER AND TENDER THEIR RESTRICTED
NOTES MUST COMPLETE THIS LETTER OF TRANSMITTAL IN ITS ENTIRETY AND COMPLY WITH
ALL OF ITS TERMS.
 
    List below the Restricted Notes to which this Letter of Transmittal relates.
If the space provided below is inadequate, the Certificate Numbers and Principal
Amounts should be listed on a separate signed schedule, attached hereto. The
minimum permitted tender is $1,000 in principal amount of the Restricted Notes.
All other tenders must be in integral multiples of $1,000.
 
<TABLE>
<CAPTION>
 --------------------------------------------------------------------------------------------------
 --------------------------------------------------------------------------------------------------
          DESCRIPTION OF RESTRICTED NOTES                   1               2               3
- ----------------------------------------------------------------------------------------------------
<S>                                                   <C>             <C>             <C>
                                                       CERTIFICATE      AGGREGATE       PRINCIPAL
                                                        NUMBER(S)*      PRINCIPAL       AMOUNT OF
                                                                        AMOUNT OF       RESTRICTED
  NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S):                        NOTES           NOTES
             (PLEASE FILL IN, IF BLANK)                                                 TENDERED**
- ----------------------------------------------------------------------------------------------------
 
                                                      ----------------------------------------------
 
                                                      ----------------------------------------------
 
                                                      ----------------------------------------------
 
                                                      ----------------------------------------------
 
                                                      ----------------------------------------------
                                                          Total
- --------------------------------------------------------------------------------------------------
 
*   Need not be completed by book-entry holders.
**  Need not be completed by Holders who wish to tender all Restricted Notes listed.
- --------------------------------------------------------------------------------------------------
</TABLE>
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
              PLEASE READ CAREFULLY THE ACCOMPANYING INSTRUCTIONS
 
                       SPECIAL REGISTRATION INSTRUCTIONS
                         (SEE INSTRUCTIONS 4, 5 AND 6)
 
      To be completed ONLY if certificates for Restricted Notes in a principal
  amount not tendered, or Exchange Notes issued in exchange for Restricted
  Notes accepted for exchange, are to be issued in the name of someone other
  than the undersigned.
 
  Issue certificate(s) to:
 
  Name(s) ____________________________________________________________________
  Address ____________________________________________________________________
 
                                (INCLUDE ZIP CODE)
 
  ____________________________________________________________________________
                         (TAX IDENTIFICATION OR SOCIAL
                              SECURITY NUMBER(S))
 
   -------------------------------------------------------------------
   -------------------------------------------------------------------
 
                         SPECIAL DELIVERY INSTRUCTIONS
                         (SEE INSTRUCTIONS 4, 5 AND 6)
 
      To be completed ONLY if certificates for Restricted Notes in a principal
  amouint not tendered, or Exchange Notes issued in exchange for Restricted
  Notes accepted for exchange, are to be delivered to someone other than the
  undersigned.
 
  Deliver certificate(s) to:
 
  Name(s) ____________________________________________________________________
 
  Address ____________________________________________________________________
 
                                (INCLUDE ZIP CODE)
 
  ____________________________________________________________________________
                         (TAX IDENTIFICATION OR SOCIAL
                              SECURITY NUMBER(S))
   -------------------------------------------------------------------
 
IMPORTANT: THIS LETTER OF TRANSMITTAL OR A FACSIMILE HEREOF (TOGETHER WITH THE
CERTIFICATE(S) FOR RESTRICTED NOTES AND ALL OTHER REQUIRED DOCUMENTS) OR A
CONFIRMATION OF BOOK-ENTRY TRANSFER AND AGENT'S MESSAGE OF SUCH RESTRICTED NOTES
MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE. IF
GUARANTEED DELIVERY PROCEDURES ARE TO BE COMPLIED WITH, A NOTICE OF GUARANTEED
DELIVERY MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE.
 
<TABLE>
<S>        <C>
HOLDERS WHOSE RESTRICTED NOTES ARE NOT IMMEDIATELY AVAILABLE OR WHO CANNOT DELIVER THEIR RESTRICTED NOTES
AND ALL OTHER DOCUMENTS REQUIRED HEREBY TO THE EXCHANGE AGENT ON OR PRIOR TO THE EXPIRATION DATE MAY TENDER
THEIR RESTRICTED NOTES ACCORDING TO THE GUARANTEED DELIVERY PROCEDURES SET FORTH IN THE PROSPECTUS UNDER THE
CAPTION "THE EXCHANGE OFFER--GUARANTEED DELIVERY PROCEDURES." (SEE INSTRUCTION 2.)
 
/ /        CHECK HERE IF RESTRICTED NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY
           PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE THE FOLLOWING:
 
           NAME(S) OF TENDERING HOLDER(S)
 
           DATE OF EXECUTION OF NOTICE OF GUARANTEED DELIVERY
 
           NAME OF INSTITUTION WHICH GUARANTEES DELIVERY
 
           TRANSACTION CODE NUMBER
 
/ /        CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL COPIES OF THE PROSPECTUS
           AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.
 
           NAME:
 
           ADDRESS:
</TABLE>
 
                                       3
<PAGE>
If the undersigned is not a broker-dealer, the undersigned represents that (1)
it is acquiring the Exchange Notes in the ordinary course of its business, (2)
it has no arrangements or understanding with any person, nor does it intend to
engage in, a distribution (as that term is interpreted by the SEC) of Exchange
Notes and (3) it is not an affiliate (as that term is interpreted by the SEC) of
the Company. If the undersigned is a broker-dealer that will receive Exchange
Notes for its own account in exchange for Restricted Notes that were acquired as
a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such Exchange Notes; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.
 
NOTE: SIGNATURES MUST BE PROVIDED BELOW.
PLEASE READ ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    Subject to the terms and conditions of the Exchange Offer, the undersigned
hereby tenders to Tyco International Group S.A. (the "Company") the principal
amount of Restricted Notes indicated above.
 
    Subject to and effective upon the acceptance for exchange of the principal
amount of Restricted Notes tendered hereby in accordance with the terms of the
Exchange Offer described in the prospectus, this Letter of Transmittal and the
accompanying Instructions, the undersigned sells, assigns and transfers to, or
upon the order of, the Company all right, title and interest in and to the
Restricted Notes tendered hereby. The undersigned hereby irrevocably constitutes
and appoints the Exchange Agent as its agent and attorney-in-fact (with full
knowledge that the Exchange Agent also acts as the agent of the Company and as
Trustee and Registrar under the Indenture for the Restricted Notes and the
Exchange Notes) with respect to the tendered Restricted Notes with full power of
substitution (such power of attorney being deemed an irrevocable power coupled
with an interest), subject only to the right of withdrawal described in the
Prospectus, to (1) deliver certificates for such Restricted Notes to the Company
or transfer ownership of such Restricted Notes on the account books maintained
by DTC, together, in either such case, with all accompanying evidences of
transfer and authenticity to, or upon the order of, the Company and (2) present
such Restricted Notes for transfer on the books of the Company and receive all
benefits and otherwise exercise all rights of beneficial ownership of such
Restricted Notes, all in accordance with the terms of the Exchange Offer.
 
    The undersigned acknowledges that the Exchange Offer is being made in
reliance upon interpretative advice given by the staff of the SEC to third
parties in connection with transactions similar to the Exchange Offer, so that
the Exchange Notes issued pursuant to the Exchange Offer in exchange for the
Restricted Notes may be offered for resale, resold and otherwise transferred by
holders thereof (other than a broker-dealer who purchased such Restricted Notes
directly from the Company for resale pursuant to Rule 144A, Regulation S or any
other available exemption under the Securities Act or a person that is an
"affiliate" of the Company within the meaning of Rule 405 under the Securities
Act) without compliance with the registration and prospectus delivery provisions
of the Securities Act, provided that such Exchange Notes are acquired by
non-affiliates of the Company in the ordinary course of such holders' business
and such holders are not participating, do not intend to participate and have no
arrangement or understanding with any person to participate, in the distribution
of such Exchange Notes.
 
    The undersigned agrees that acceptance of any tendered Restricted Notes by
the Company and the issuance of Exchange Notes in exchange therefor shall
constitute performance in full by the Company of its obligations under the
Exchange Offer and Registration Rights Agreement and that, upon the issuance of
the Exchange Notes, the Company will have no further obligations or liabilities
thereunder (except in certain limited circumstances).
 
    The undersigned represents and warrants that (1) the Exchange Notes acquired
pursuant to the Exchange Offer are being acquired in the ordinary course of
business of the person receiving Exchange Notes (which shall be the undersigned
unless otherwise indicated in the box entitled "Special Delivery Instructions"
above) (the "Recipient"), (2) neither the undersigned nor the Recipient (if
different) is engaged in, intends to engage in or has any arrangement or
understanding with any person to participate in the distribution (as that term
is interpreted by the SEC) of such Exchange Notes, and (3) neither the
undersigned nor the Recipient (if different) is an "affiliate" of the Company as
defined in Rule 405 under the Securities Act.
 
    If the undersigned is a broker-dealer, the undersigned further (1)
represents that it acquired Restricted Notes for the undersigned's own account
as a result of market-making activities or other trading activities, (2)
represents that it has not entered into any arrangement or understanding with
the Company or any "affiliate" of the Company (within the meaning of Rule 405
under the Securities Act) to distribute the Exchange Notes to be received in the
Exchange Offer and (3) acknowledges that it will deliver a prospectus meeting
the requirements of the Securities Act (for which purposes, the delivery of the
Prospectus, as the same may be hereafter supplemented or amended, shall be
sufficient) in connection with any resale of Exchange Notes received in the
Exchange Offer. Such a broker-dealer will not be deemed, solely by reason of
such acknowledgment and prospectus delivery, to admit that it is an
"underwriter" within the meaning of the Securities Act.
 
                                       4
<PAGE>
    The undersigned understands and agrees that the Company reserves the right
not to accept tendered Restricted Notes from any tendering holder if the Company
determines, in its sole and absolute discretion, that such acceptance could
result in a violation of applicable securities laws.
 
    The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, exchange, assign and transfer the Restricted
Notes tendered hereby and to acquire Exchange Notes issuable upon the exchange
of such tendered Restricted Notes, and that, when the same are accepted for
exchange, the Company will acquire good and unencumbered title thereto, free and
clear of all liens, restrictions, charges and encumbrances and not subject to
any adverse claim. The undersigned also warrants that it will, upon request,
execute and deliver any additional documents deemed to be necessary or desirable
by the Exchange Agent or the Company in order to complete the exchange,
assignment and transfer of tendered Restricted Notes or transfer of ownership of
such Restricted Notes on the account books maintained by a book-entry transfer
facility.
 
    The undersigned understands and acknowledges that the Company reserves the
right in its sole discretion to purchase or make offers for any Restricted Notes
that remain outstanding subsequent to the Expiration Date or, as set forth in
the Prospectus under the caption "The Exchange Offer--Procedures for Tendering,"
to terminate the Exchange Offer and, to the extent permitted by applicable law,
purchase Restricted Notes in the open market, in privately negotiated
transactions or otherwise. The terms of any such purchases or offers could
differ from the terms of the Exchange Offer.
 
    The undersigned understands that the Company may accept the undersigned's
tender by delivering written notice of acceptance to the Exchange Agent, at
which time the undersigned's right to withdraw such tender will terminate. For
purposes of the Exchange Offer, the Company shall be deemed to have accepted
validly tendered Restricted Notes when, as and if the Company has given oral
(which shall be confirmed in writing) or written notice thereof to the Exchange
Agent.
 
    The undersigned understands that the first interest payment following the
Expiration Date will include unpaid interest on the Restricted Notes accrued
through the date of issuance of the Exchange Notes.
 
    The undersigned understands that tenders of Restricted Notes pursuant to the
procedures described under the caption "The Exchange Offer--Procedures for
Tendering" in the Prospectus and in the instructions hereto will constitute a
binding agreement between the undersigned, the Company and the Exchange Agent in
accordance with the terms and subject to the conditions of the Exchange Offer.
 
    If any tendered Restricted Notes are not accepted for exchange pursuant to
the Exchange Offer for any reason, certificates for any such unaccepted
Restricted Notes will be returned, at the Company's cost and expense, to the
undersigned at the address shown below or at a different address as may be
indicated herein under "Special Delivery Instructions" as promptly as
practicable after the Expiration Date.
 
    All authority conferred or agreed to be conferred by this Letter of
Transmittal shall survive the death, incapacity or dissolution of the
undersigned, and every obligation of the undersigned under this Letter of
Transmittal shall be binding on the undersigned's heirs, personal
representatives, successors and assigns. This tender may be withdrawn only in
accordance with the procedures set forth in the prospectus and in this Letter of
Transmittal.
 
    By acceptance of the Exchange Offer, each broker-dealer that receives
Exchange Notes pursuant to the Exchange Offer hereby acknowledges and agrees
that upon the receipt of notice by the Company of the happening of any event
that makes any statement in the Prospectus untrue in any material respect or
that requires the making of any changes in the Prospectus in order to make the
statements therein not misleading (which notice the Company agrees to deliver
promptly to such broker-dealer), such broker-dealer will suspend use of the
Prospectus until the Company has amended or supplemented the Prospectus to
correct such misstatement or omission and has furnished copies of the amended or
supplemented prospectus to such broker-dealer.
 
    Unless otherwise indicated under "Special Registration Instructions," please
issue the certificates representing the Exchange Notes issued in exchange for
the Restricted Notes accepted for exchange and return any certificates for
Restricted Notes not tendered or not exchanged, in the name(s) of the
undersigned. Similarly, unless otherwise indicated under "Special Delivery
Instructions," please send the certificates representing the Exchange Notes
issued in exchange for the Restricted Notes accepted for exchange and any
certificates for Restricted Notes not tendered or not exchanged (and
accompanying documents, as appropriate) to the undersigned at the address shown
below the undersigned's signature(s). In the event that both "Special
Registration Instructions" and "Special Delivery Instructions" are completed,
please issue the certificates representing the Exchange Notes issued in exchange
for the Restricted Notes accepted for exchange in the name(s) of, and return any
certificates for Restricted Notes not tendered or not exchanged to, the
person(s) so indicated. The undersigned understands that the Company has no
obligations pursuant to the "Special Registration Instructions" or "Special
Delivery Instructions" to transfer any Restricted Notes from the name of the
registered Holder(s) thereof if the Company does not accept for exchange any of
the Restricted Notes so tendered.
 
                                       5
<PAGE>
    Holders who wish to tender the Restricted Notes and (1) whose Restricted
Notes are not immediately available or (2) who cannot deliver their Restricted
Notes, this Letter of Transmittal or any other documents required hereby to the
Exchange Agent prior to the Expiration Date, may tender their Restricted Notes
according to the guaranteed delivery procedures set forth in the Prospectus
under the caption "Exchange Offer--Guaranteed Delivery Procedures." (See
Instruction 2.)
 
- --------------------------------------------------------------------------------
 
         PLEASE SIGN HERE WHETHER OR NOT WHETHER OR NOT TENDER IS TO BE
              MADE PURSUANT TO THE GUARANTEED DELIVERY PROCEDURES
                  (PLEASE COMPLETE SUBSTITUTE FORM W-9 HEREIN)
 
      This Letter of Transmittal must be signed by the registered holder(s) as
  its (their) name(s) appear on the Restricted Notes, or by person(s)
  authorized to become registered holder(s) by a properly completed bond power
  from the registered holder(s), a copy of which must be transmitted with this
  Letter of Transmittal. If the Restricted Notes to which this Letter of
  Transmittal relate are held of record by two or more joint holders, then all
  such holders must sign this Letter of Transmittal. If signature is by a
  trustee, executor, administrator, guardian, attorney-in-fact, officer of a
  corporation or other person acting in a fiduciary or representative
  capacity, then such person must (1) set forth his or her full title below
  and (2) unless waived by the Company, submit evidence satisfactory to the
  Company of such person's authority so to act. (See Instruction 4.)
 
        ----------------------------------------------------------------
 
                          (SIGNATURE(S) OF HOLDER(S))
 
  Date: ____________, 1999
  Name(s) ____________________________________________________________________
                                 (PLEASE PRINT)
 
  Capacity (full title) ______________________________________________________
  Address ____________________________________________________________________
                               (INCLUDE ZIP CODE)
 
  Area Code and Telephone Number _____________________________________________
  ____________________________________________________________________________
               (TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER(S))
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
                           GUARANTEE OF SIGNATURE(S)
                              (SEE INSTRUCTION 1)
 
        ----------------------------------------------------------------
 
                             (AUTHORIZED SIGNATURE)
 
  Date: ____________, 1999
  Name of Firm _______________________________________________________________
  Capacity (full title) ______________________________________________________
  Address ____________________________________________________________________
                               (INCLUDE ZIP CODE)
 
  Area Code and Telephone Number _____________________________________________
- --------------------------------------------------------------------------------
 
                                       6
<PAGE>
                                  INSTRUCTIONS
         FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER
 
    1. GUARANTEE OF SIGNATURES. Signatures on this Letter of Transmittal need
not be guaranteed if (a) this Letter of Transmittal is signed by the registered
holder(s) of the Restricted Notes tendered herewith and such holder(s) have not
completed the box set forth herein entitled "Special Registration Instructions"
or the box entitled "Special Delivery Instructions" or (b) such Restricted Notes
are tendered for the account of a member firm of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.
or a commercial bank or trust company having an office or correspondent in the
United States (each, an "Eligible Institution"). (See Instruction 6.) Otherwise,
all signatures on this Letter of Transmittal or a notice of withdrawal, as the
case may be, must be guaranteed by an Eligible Institution. All signatures on
bond powers and endorsements on certificates must also be guaranteed by an
Eligible Institution.
 
    2. DELIVERY OF THIS LETTER OF TRANSMITTAL AND RESTRICTED NOTES. Certificates
for all physically delivered Restricted Notes or confirmation of any book-entry
transfer to the Exchange Agent at DTC of Restricted Notes tendered by book-entry
transfer, as well as, in the case of physical delivery of Restricted Notes, a
properly completed and duly executed copy of this Letter of Transmittal or
facsimile hereof and any other documents required by this Letter of Transmittal,
must be received by the Exchange Agent at its address set forth herein prior to
5:00 p.m. New York City time on the Expiration Date. The method of delivery of
the tendered Restricted Notes, this Letter of Transmittal and all other required
documents, or book-entry transfer and transmission of an Agent's Message by a
DTC participant, to the Exchange Agent is at the election and risk of the Holder
and the delivery will be deemed made only when actually received by the Exchange
Agent. If Restricted Notes are sent by mail, registered mail with return receipt
requested, properly insured, is recommended. In all cases, sufficient time
should be allowed to ensure timely delivery. No Letter of Transmittal or
Restricted Notes should be sent to the Company or the Depository Trust Company.
 
    The Exchange Agent will make a request to establish an account with respect
to the Restricted Notes at DTC for purposes of the Exchange Offer promptly after
receipt of this Prospectus, and any financial institution that is a participant
in DTC may make book-entry delivery of Restricted Notes by causing DTC to
transfer such Restricted Notes into the Exchange Agent's account at DTC in
accordance with DTC's procedures for transfer. However, although delivery of
Restricted Notes may be effected through book-entry transfer at DTC, an Agent's
Message (as defined in the next paragraph) in connection with a book-entry
transfer and any other required documents, must, in any case, be transmitted to
and received by the Exchange Agent at the address specified on the cover page of
the Letter of Transmittal on or prior to the Expiration Date or the guaranteed
delivery procedures described below must be complied with.
 
    A Holder may tender Restricted Notes that are held through DTC by
transmitting its acceptance through DTC's Automatic Tender Offer Program, for
which the transaction will be eligible, and DTC will then edit and verify the
acceptance and send an Agent's Message to the Exchange Agent for its acceptance.
The term "Agent's Message" means a message transmitted by DTC to, and received
by, the Exchange Agent and forming part of the Book-Entry Confirmation, which
states that DTC has received an express acknowledgment from each participant in
DTC tendering the Restricted Notes and that such participant has received the
Letter of Transmittal and agrees to be bound by the terms of the Letter of
Transmittal and the Company may enforce such agreement against such participant.
Delivery of an Agent's Message will also constitute an acknowledgment from the
tendering DTC participant that the representations and warranties set forth on
page 4 of this Letter of Transmittal are true and correct.
 
    Holders who wish to tender their Restricted Notes and (1) whose Restricted
Notes are not immediately available, or (2) who cannot deliver their Restricted
Notes, this Letter of Transmittal or any other documents required hereby to the
Exchange Agent prior to the Expiration Date or comply with book-entry transfer
procedures on a timely basis must tender their Restricted Notes according to the
guaranteed delivery procedures set forth in the Prospectus. See "Exchange
Offer--Guaranteed Delivery Procedures." Pursuant to such procedure: (1) such
tender must be made by or through an Eligible Institution; (2) prior to the
Expiration Date, the Exchange Agent must have received from the Eligible
Institution a properly completed and duly executed Notice of Guaranteed Delivery
(by facsimile transmission, overnight courier, mail or hand delivery) setting
forth the name and address of the Holder of the Restricted Notes, the
certificate number or numbers of such Restricted Notes and the principal amount
of Restricted Notes tendered, stating that the tender is being made thereby and
guaranteeing that, within three New York Stock Exchange trading days after the
Expiration Date, this Letter of Transmittal (or facsimile hereof) or any Agent's
Message together with the certificate(s) representing the Restricted Notes or
book-entry transfer, as the case may be, and any other required documents will
be deposited by the Eligible Institution with the Exchange Agent; and (3) such
properly completed and executed Letter of Transmittal (or facsimile hereof), as
well as all other documents required by this Letter of
 
                                       7
<PAGE>
Transmittal and the certificate(s) representing all tendered Restricted Notes in
proper form for transfer (or a confirmation of book-entry transfer of such
Restricted Notes into the Exchange Agent's account at DTC), must be received by
the Exchange Agent within three New York Stock Exchange trading days after the
Expiration Date, all in the manner provided in the Prospectus under the caption
"Exchange Offer--Guaranteed Delivery Procedures." Any Holder who wishes to
tender his, her or its Restricted Notes pursuant to the guaranteed delivery
procedures described above must ensure that the Exchange Agent receives the
Notice of Guaranteed Delivery prior to 5:00 p.m. New York City time on the
Expiration Date. Upon request to the Exchange Agent, a Notice of Guaranteed
Delivery will be sent to Holders who wish to tender their Restricted Notes
according to the guaranteed delivery procedures set forth above.
 
    All questions as to the validity, form, eligibility (including time of
receipt), acceptance of tendered Restricted Notes, and withdrawal of tendered
Restricted Notes will be determined by the Company in its sole discretion, which
determination will be final and binding. All tendering holders, by execution of
this Letter of Transmittal (or facsimile thereof), shall waive any right to
receive notice of the acceptance of the Restricted Notes for exchange. The
Company reserves the absolute right to reject any and all Restricted Notes not
properly tendered or any Restricted Notes the Company's acceptance of which
would, in the opinion of counsel for the Company, be unlawful. The Company also
reserves the right to waive any irregularities or conditions of tender as to
particular Restricted Notes. The Company's interpretation of the terms and
conditions of the Exchange Offer (including the instructions in this Letter of
Transmittal) shall be final and binding on all parties. Unless waived, any
defects or irregularities in connection with tenders of Restricted Notes must be
cured within such time as the Company shall determine. Neither the Company, the
Exchange Agent nor any other person shall be under any duty to give notification
of defects or irregularities with respect to tenders of Restricted Notes, nor
shall any of them incur any liability for failure to give such notification.
Tenders of Restricted Notes will not be deemed to have been made until such
defects or irregularities have been cured to the Company's satisfaction or
waived. Any Restricted Notes received by the Exchange Agent that are not
properly tendered and as to which the defects or irregularities have not been
cured or waived will be returned by the Exchange Agent to the tendering Holders
pursuant to the Company's determination, unless otherwise provided in this
Letter of Transmittal as soon as practicable following the Expiration Date.
 
    3. INADEQUATE SPACE. If the space provided is inadequate, the certificate
numbers and/or the number of Restricted Notes should be listed on a separate
signed schedule attached hereto.
 
    4. TENDER BY HOLDER. Only a registered Holder of Restricted Notes or a DTC
participant listed on a securities position listing furnished by DTC with
respect to the Restricted Notes may tender its Restricted Notes in the Exchange
Offer. Any beneficial owner of Restricted Notes who is not the registered Holder
and is not a DTC participant and who wishes to tender should arrange with such
registered holder to execute and deliver this Letter of Transmittal on such
beneficial owner's behalf or must, prior to completing and executing this Letter
of Transmittal and delivering his, her or its Restricted Notes, either make
appropriate arrangements to register ownership of the Restricted Notes in such
beneficial owner's name or obtain a properly completed bond power from the
registered holder or properly endorsed certificates representing such Restricted
Notes.
 
    5. PARTIAL TENDERS; WITHDRAWALS. Tenders of Restricted Notes will be
accepted only in integral multiples of $1,000. If less than the entire principal
amount of any Restricted Notes is tendered, the tendering Holder should fill in
the principal amount tendered in the third column of the box entitled
"Description of Restricted Notes" above. The entire principal amount of any
Restricted Notes delivered to the Exchange Agent will be deemed to have been
tendered unless otherwise indicated. If the entire principal amount of all
Restricted Notes is not tendered, then Restricted Notes for the principal amount
of Restricted Notes not tendered and a certificate or certification representing
Exchange Notes issued in exchange for any Restricted Notes accepted will be sent
to the Holder at his, her or its registered address, unless a different address
is provided in the "Special Delivery Instructions" box above on this Letter of
Transmittal or unless tender is made through DTC, promptly after the Restricted
Notes are accepted for exchange.
 
    Except as otherwise provided herein, tenders of Restricted Notes may be
withdrawn at any time prior to the Expiration Date. To withdraw a tender of
Restricted Notes in the Exchange Offer, a written or facsimile transmission
notice of withdrawal must be received by the Exchange Agent at its address set
forth herein prior to the Expiration Date. Any such notice of withdrawal must
(1) specify the name of the person having deposited the Restricted Notes to be
withdrawn (the "Depositor"), (2) identify the Restricted Notes to be withdrawn
(including the certificate number or numbers and principal amount of such
Restricted Notes, or, in the case of Restricted Notes transferred by book-entry
transfer the name and number of the account at DTC to be credited), (3) be
signed by the Depositor in the same manner as the original signature on the
Letter of Transmittal by which such Restricted Notes were tendered (including
any required signature guarantees) or be accompanied by documents of transfer
sufficient to have the Registrar with respect to the Restricted Notes register
the transfer of such Restricted Notes into the name of the person withdrawing
the tender and (4) specify the name in which any such Restricted Notes are to be
registered, if
 
                                       8
<PAGE>
different from that of the Depositor. All questions as to the validity, form and
eligibility (including time of receipt) of such notices will be determined by
the Company, whose determination shall be final and binding on all parties. Any
Restricted Notes so withdrawn will be deemed not to have been validly tendered
for purposes of the Exchange Offer and no Exchange Notes will be issued with
respect thereto unless the Restricted Notes so withdrawn are validly retendered.
Any Restricted Notes which have been tendered but which are not accepted for
exchange by the Company will be returned to the Holder thereof without cost to
such Holder as soon as practicable after withdrawal, rejection of tender or
termination of the Exchange Offer. Properly withdrawn Restricted Notes may be
retendered by following one of the procedures described in the Prospectus under
"Exchange Offer--Procedures for Tendering" at any time prior to the Expiration
Date.
 
    6. SIGNATURES ON THE LETTER OF TRANSMITTAL; BOND POWERS AND ENDORSEMENTS. If
this Letter of Transmittal (or facsimile hereof) is signed by the registered
Holder(s) of the Restricted Notes tendered hereby, the signature must correspond
with the name(s) as written on the face of the Restricted Note without
alteration, enlargement or any change whatsoever.
 
    If any of the Restricted Notes tendered hereby are owned of record by two or
more joint owners, all such owners must sign this Letter of Transmittal.
 
    If a number of Restricted Notes registered in different names are tendered,
it will be necessary to complete, sign and submit as many copies of this Letter
of Transmittal as there are different registrations of Restricted Notes.
 
    If this Letter of Transmittal (or facsimile hereof) is signed by the
registered Holder or Holders (which term, for the purposes described herein,
shall include a book-entry transfer facility whose name appears on a security
listing as the owner of the Restricted Notes) of Restricted Notes tendered and
the certificate or certificates for Exchange Notes issued in exchange therefor
is to be issued (or any untendered principal amount of Restricted Notes to be
reissued) to the registered Holder, then such Holder need not and should not
endorse any tendered Restricted Notes, nor provide a separate bond power. In any
other case, such Holder must either properly endorse the Restricted Notes
tendered or transmit a properly completed separate bond power with this Letter
of Transmittal with the signatures on the endorsement or bond power guaranteed
by an Eligible Institution.
 
    If this Letter of Transmittal (or facsimile hereof) is signed by a person
other than the registered Holder or Holders of any Restricted Notes listed, such
Restricted Notes must be endorsed or accompanied by appropriate bond powers in
each case signed as the name of the registered Holder or Holders appears on the
Restricted Notes.
 
    If this Letter of Transmittal (or facsimile hereof) or any Restricted Notes
or bond powers are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, or officers of corporations or others acting in a fiduciary
or representative capacity, such persons should so indicate when signing, and
unless waived by the Company, evidence satisfactory to the Company of their
authority so to act must be submitted with this Letter of Transmittal.
 
    Endorsements on Restricted Notes or signatures on bond powers required by
this Instruction 6 must be guaranteed by an Eligible Institution.
 
    7. SPECIAL REGISTRATION AND DELIVERY INSTRUCTIONS. Tendering Holders should
indicate, in the applicable box or boxes, the name and address to which Exchange
Notes or substitute Restricted Notes for principal amounts not tendered or not
accepted for exchange are to be issued or sent, if different from the name and
address of the person signing this Letter of Transmittal. In the case of
issuance in a different name, the taxpayer identification or social security
number of the person named must also be indicated.
 
    8. BACKUP UNITED STATES FEDERAL INCOME TAX WITHHOLDING AND SUBSTITUTE FORM
W-9. Under the United States federal income tax laws, payments that may be made
by the Company on account of Exchange Notes issued pursuant to the Exchange
Offer may be subject to backup withholding at the rate of 31%. In order to avoid
such backup withholding, each tendering holder should complete and sign the
Substitute Form W-9 included in this Letter of Transmittal and either (a)
provide the correct taxpayer identification number ("TIN") and certify, under
penalties of perjury, that the TIN provided is correct and that (1) the Holder
has not been notified by the United States Internal Revenue Service the ("IRS")
that the Holder is subject to backup withholding as a result of failure to
report all interest or dividends or (2) the IRS has notified the Holder that the
Holder is no longer subject to backup withholding; or (b) provide an adequate
basis for exemption. If the tendering Holder has not been issued a TIN and has
applied for one, or intends to apply for one in the near future, such Holder
should write "Applied For" in the space provided for the TIN in Part I of the
Substitute Form W-9, sign and date the Substitute Form W-9 and sign the
Certificate of Payee Awaiting Taxpayer Identification Number. If "Applied For"
is written in Part I, the Company (or the Paying Agent under the Indenture
governing the Exchange Notes) shall retain 31% of payments made to the tendering
Holder during the 60-day period following the date of the Substitute Form W-9.
If the Holder furnishes his, her or its TIN within 60 days after the date of the
Substitute Form W-9, the Company (or the Paying Agent) shall
 
                                       9
<PAGE>
remit such amounts retained during the 60-day period to the Holder and no
further amounts shall be retained or withheld from payments made to the Holder
thereafter. If, however, the Holder has not provided the Exchange Agent or the
Company with his, her or its TIN within such 60-day period, the Company (or the
Paying Agent) shall remit such previously retained amounts to the IRS as backup
withholding. In general, if a Holder is an individual, the TIN is the social
security number of such individual. If the Exchange Agent or the Company are not
provided with the correct TIN, the Holder may be subject to a $50 penalty
imposed by the IRS.
 
    Certain Holders (including, among others, all corporations and certain
non-United States individuals) are not subject to these backup withholding and
reporting requirements. In order for a non-United States individual to qualify
as an exempt recipient, such Holder must submit a statement (generally, IRS Form
W-8), signed under penalties of perjury, attesting to that individual's exempt
status. Such statements can be obtained from the Exchange Agent. For further
information concerning backup withholding and instructions for completing the
Substitute Form W-9 (including how to obtain a taxpayer identification number if
you do not have one and how to complete the Substitute Form W-9 if Restricted
Notes are registered in more than one name), consult the enclosed Guidelines for
Certification of Taxpayer Identification Number on Substitute Form W-9. Failure
to complete the Substitute Form W-9 will not, by itself, cause Restricted Notes
to be deemed invalidly tendered, but may require the Company (or the Paying
Agent) to withhold 31% of the amount of any payments made on account of the
Exchange Notes. Backup withholding is not an additional federal income tax.
Rather, the federal income tax liability of a person subject to backup
withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained from the IRS.
 
    9. TRANSFER TAXES. The Company will pay all transfer taxes, if any,
applicable to the exchange of Restricted Notes pursuant to the Exchange Offer.
If, however, certificates representing Exchange Notes or Restricted Notes for
principal amounts not tendered or accepted for exchange are to be delivered to,
or are to be registered in the name of, any person other than the registered
Holder of the Restricted Notes tendered hereby, or if tendered Restricted Notes
are registered in the name of a person other than the person signing this Letter
of Transmittal, or if a transfer tax is imposed for any reason other than the
exchange of Restricted Notes pursuant to the Exchange Offer, then the amount of
any such transfer taxes (whether imposed on the registered Holder or on any
other persons) will be payable by the tendering Holder. If satisfactory evidence
of payment of such taxes or exemption therefrom is not submitted with this
Letter of Transmittal, the amount of such transfer taxes will be billed directly
to such tendering Holder. See the Prospectus under "Exchange Offer--Solicitation
of Tenders; Fees and Expenses."
 
    Except as provided in this Instruction 9, it will not be necessary for
transfer tax stamps to be affixed to the Restricted Notes listed in this Letter
of Transmittal.
 
    10. WAIVER OF CONDITIONS. The Company reserves the right, in its sole
discretion, to amend, waive or modify specified conditions in the Exchange Offer
in the case of any Restricted Notes tendered.
 
    11. MUTILATED, LOST, STOLEN OR DESTROYED RESTRICTED NOTES. Any tendering
Holder whose Restricted Notes have been mutilated, lost, stolen or destroyed
should contact the Exchange Agent at the address indicated herein for further
instructions.
 
    12. REQUESTS FOR ASSISTANCE, COPIES. Requests for assistance and requests
for additional copies of the Prospectus or this Letter of Transmittal may be
directed to the Exchange Agent at the address specified in the Prospectus.
Holders may also contact their broker, dealer, commercial bank, trust company or
other nominee for assistance concerning the Exchange Offer.
 
                         (DO NOT WRITE IN SPACE BELOW)
 
<TABLE>
<CAPTION>
          CERTIFICATE TENDERED                   RESTRICTED NOTES ACCEPTED                RESTRICTED NOTES SURRENDERED
- ----------------------------------------  ----------------------------------------  ----------------------------------------
<S>                                       <C>                                       <C>
 
- ----------------------------------------  ----------------------------------------  ----------------------------------------
 
- ----------------------------------------  ----------------------------------------  ----------------------------------------
</TABLE>
 
Received _________ Accepted by _________ Checked by _________
Delivery Prepared by ________ Checked by ________ Date ________
 
                                       10
<PAGE>
                           IMPORTANT TAX INFORMATION
 
    Under United States federal income tax laws, to avoid imposition of a 31%
backup withholding with respect to payments made under the Exchange Notes a
Holder whose tendered Restricted Notes are accepted for payment should provide
the Exchange Agent with such Holder's correct TIN on Substitute Form W-9 below
or otherwise establish a basis for exemption from backup withholding. If such
Holder is an individual, the TIN is his social security number. If the Exchange
Agent is not provided with the correct TIN, a $50 penalty may be imposed by the
Internal Revenue Service, and payments made under the Exchange Note may be
subject to backup withholding.
 
    Certain Holders (including, among others, all corporations and certain
non-United States persons) are not subject to these backup withholding and
reporting requirements. Exempt Holders should indicate their exempt status on
Substitute Form W-9. A non-United States person may qualify as an exempt
recipient by submitting to the Exchange Agent a properly completed Internal
Revenue Service Form W-8, signed under penalties of perjury, attesting to that
Holder's exempt status. A Form W-8 can be obtained from the Exchange Agent. See
the enclosed "Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9" for additional instructions.
 
    If backup withholding applies, the Company (or the Paying Agent under the
Indenture governing the Exchange Notes) is required to withhold 31% of any
payments made to the Holder or other payee with respect to the Exchange Notes.
Backup withholding is not an additional United States federal income tax.
Rather, the United States federal income tax liability of persons subject to
backup withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained from the Internal
Revenue Service.
 
PURPOSE OF SUBSTITUTE FORM W-9
 
    To prevent backup withholding on payments made with respect to the Exchange
Notes, the Holder should provide the Company (or the Paying Agent under the
Indenture governing the Exchange Notes) with either (a) the Holder's correct TIN
by completing the form below, certifying that the TIN provided on Substitute
Form W-9 is correct (or that such Holder is awaiting a TIN) and that (1) the
Holder has not been notified by the Internal Revenue Service that the Holder is
subject to backup withholding as a result of failure to report all interest or
dividends or (2) the Internal Revenue Service has notified the Holder that the
Holder is no longer subject to backup withholding or (b) an adequate basis for
exemption.
 
WHAT NUMBER TO GIVE
 
    The Holder is required to give the TIN (e.g., social security number or
employer identification number) of the registered Holder of the Restricted
Notes. If the Restricted Notes are held in more than one name or are held not in
the name of the actual owner, consult the enclosed "Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9" for additional
guidance on which number to report.
 
YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX
  IN PART 2 OF SUBSTITUTE FORM W-9
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
 I certify, under penalties of perjury, that a Taxpayer Identification Number
 has not been issued to me, and that I mailed or delivered an application to
 receive a Taxpayer Identification Number to the appropriate Internal Revenue
 Service Center or Social Security Administration Office (or I intend to mail
 or deliver an application in the near future). I understand that if I do not
 provide a Taxpayer Identification Number to the payer, 31% of all payments
 made to me on account of the Exchange Notes shall be retained until I provide
 a Taxpayer Identification Number within 60 days, such retained amounts shall
 be remitted to the Internal Revenue Service as backup withholding and 31% of
 all reportable payments made to me thereafter will be withheld and remitted to
 the Internal Revenue Service until I provide a Taxpayer Identification Number.
 
 Signature
 ---------------------------------------------  Date
 -------------------------- ,1999
 
                                       11
<PAGE>
   IMPORTANT: THIS LETTER OF TRANSMITTAL (OR FACSIMILE THEREOF) AND ALL OTHER
           REQUIRED DOCUMENTS MUST BE RECEIVED BY THE EXCHANGE AGENT
                      ON OR PRIOR TO THE EXPIRATION DATE.
 
                    TO BE COMPLETED BY ALL TENDERING HOLDERS
 
                              (SEE INSTRUCTION 8)
 
<TABLE>
<S>                       <C>                                <C>
- -------------------------------------------------------------------------------------------
 PAYER'S NAME: [insert]
 ------------------------------------------------------------------------------------------
                          PART 1--PLEASE PROVIDE YOUR TIN    TIN: -------------------------
                          ON THE LINE AT RIGHT AND CERTIFY     Social Security Number or
                          BY SIGNING AND DATING BELOW        Employer Identification Number
 
                          -----------------------------------------------------------------
                          PART 2--TIN Applied For / /
 
                          -----------------------------------------------------------------
 SUBSTITUTE                CERTIFICATION--UNDER THE PENALTIES OF PERJURY, I CERTIFY THAT:
 
                           (1) the number shown on this form is my correct taxpayer
                           identification number (or I
                              am waiting for a number to be issued to me),
 FORM W-9                  (2) I am not subject to backup withholding either because (i) I
 Department of the         am exempt from backup withholding, (ii) I have not been notified
 Treasury                      by the Internal Revenue Service ("IRS") that I am subject to
 Internal Revenue
 Service                       backup withholding as a result of a failure to report all
 Payor's Request For           interest or dividends, or (iii) the IRS has notified me that
 Taxpayer Identification       I am no longer subject to backup withholding, and
 Number ("TIN") and
 Certification
 
                           (3) any other information provided on this form is true and
                               correct.
 
                           Signature                                 Date  , 1999
 You must cross out item (2) in the certification above if you have been notified by the
 IRS that you are subject to backup withholding because of underreporting interest or
 dividends on your tax return and you have not been notified by the IRS that you are no
 longer subject to backup withholding.
 
- -------------------------------------------------------------------------------------------
</TABLE>
 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY IN CERTAIN CIRCUMSTANCES
RESULT IN BACKUP WITHHOLDING OF 31% OF ANY AMOUNTS PAID TO YOU ON ACCOUNT OF THE
EXCHANGE NOTES. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF
TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
                                       12
<PAGE>
                             LETTER OF TRANSMITTAL
                         TYCO INTERNATIONAL GROUP S.A.
                            TYCO INTERNATIONAL LTD.
                               OFFER TO EXCHANGE
                             6.125% NOTES DUE 2008
                                      FOR
                             6.125% NOTES DUE 2008
 
               PURSUANT TO THE PROSPECTUS DATED FEBRUARY   , 1999
 
- --------------------------------------------------------------------------------
    THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M. NEW YORK CITY TIME ON MARCH   ,
1999, UNLESS THE EXCHANGE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------
 
                 The Exchange Agent for the Exchange Offer is:
                              The Bank of New York
 
<TABLE>
<S>                               <C>                               <C>
 BY HAND OR OVERNIGHT DELIVERY:       FACSIMILE TRANSACTIONS:       BY REGISTERED OR CERTIFIED MAIL:
                                    (Eligible Institutions Only)
      The Bank of New York                 (212) 815-4699                 The Bank of New York
     101 Barclay Street, 7E           TO CONFIRM BY TELEPHONE              101 Barclay Street
    New York, New York 10286          OR FOR INFORMATION CALL:      Corporate Trust Services Window
     Attn: Denise Robinson                 (212) 815-2791                     Ground Level
                                                                        New York, New York 10286
                                                                         Attn: Denise Robinson
</TABLE>
 
- --------------------------------------------------------------------------------
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OR TRANSMISSION TO A FACSIMILE
NUMBER OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID DELIVERY. THE
   METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING CERTIFICATES, IS AT THE RISK
   OF THE HOLDER. IF DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT
   REQUESTED, PROPERLY INSURED, IS RECOMMENDED. YOU SHOULD READ THE
   INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL CAREFULLY BEFORE YOU
   COMPLETE THIS LETTER OF TRANSMITTAL.
 
    The undersigned acknowledges that he or she has received the prospectus,
dated February   , 1999 (the "Prospectus"), of Tyco International Group S.A., a
Luxembourg company (the "Company"), and Tyco International Ltd., a Bermuda
company ("Tyco"), and this Letter of Transmittal and the instructions hereto
(the "Letter of Transmittal"), which together constitute the Company's offer
(the "Exchange Offer") to exchange $1,000 principal amount of 6.125% Notes due
2008 (the "Exchange Notes"), which have been registered under the Securities Act
of 1933, as amended (the "Securities Act"), pursuant to a Registration Statement
of which the Prospectus is a part, for each $1,000 principal amount of its
outstanding 6.125% Notes due 2008 (the "Restricted Notes"), of which
$400,000,000 aggregate principal amount is outstanding, upon the terms and
subject to the conditions set forth in the Prospectus. The term "Expiration
Date" shall mean 5:00 p.m. New York City time on March   , 1999, unless the
Company, in its sole discretion, extends the Exchange Offer, in which case the
term shall mean the latest date and time to which the Exchange Offer is extended
by the Company. Capitalized terms used but not defined herein have the meaning
given to them in the Prospectus.
 
    This Letter of Transmittal is to be used if either (1) certificates
representing Restricted Notes are to be physically delivered to the Exchange
Agent herewith by Holders (as defined below) or (2) tender of Restricted Notes
is to be made by Holders according to the guaranteed delivery procedures set
forth in the Prospectus under "Exchange Offer--Guaranteed Delivery Procedures."
Delivery of this Letter of Transmittal and any other required documents must be
made to the Exchange Agent.
 
    DELIVERY OF DOCUMENTS TO DTC IN ACCORDANCE WITH DTC'S PROCEDURES DOES NOT
CONSTITUTE DELIVERY TO THE EXCHANGE AGENT.
<PAGE>
    The term "Holder" as used herein means any person in whose name Restricted
Notes are registered on the books of the Company or any other person who has
obtained a properly completed bond power from the registered holder.
 
    All Holders of Restricted Notes who wish to tender their Restricted Notes
must, prior to the Expiration Date either: (a) complete, sign and deliver this
Letter of Transmittal, or a facsimile thereof, to the Exchange Agent, in person
or to the address or facsimile number set forth above and tender (and not
withdraw) his, her or its Restricted Notes or, (b) if a tender of Restricted
Notes is to be made by book-entry transfer to the account maintained by the
Exchange Agent at DTC, confirm such book-entry transfer including the delivery
of an Agent's Message (a "Book-Entry Confirmation"), in each case in accordance
with the procedures for tendering described in the Instructions to this Letter
of Transmittal. Holders of Restricted Notes whose certificates are not
immediately available, or who are unable to deliver their certificates or
Book-Entry Confirmation and all other documents required by this Letter of
Transmittal to be delivered to the Exchange Agent on or prior to the Expiration
Date, must tender their Restricted Notes according to the guaranteed delivery
procedures set forth under the caption "Exchange Offer--Guaranteed Delivery
Procedures" in the Prospectus. (See Instruction 2.)
 
    Upon the terms and subject to the conditions of the Exchange Offer, the
acceptance for exchange of the Restricted Notes validly tendered and not
withdrawn and the issuance of the Exchange Notes will be made promptly following
the Expiration Date. For the purposes of the Exchange Offer, the Company shall
be deemed to have accepted for exchange validly tendered Restricted Notes when,
as and if the Company has given written notice thereof to the Exchange Agent.
 
    The undersigned has completed, executed and delivered this Letter of
Transmittal to indicate the action the undersigned desires to take with respect
to the Exchange Offer.
 
    PLEASE READ THIS ENTIRE LETTER OF TRANSMITTAL AND THE PROSPECTUS CAREFULLY
BEFORE CHECKING ANY BOX BELOW. THE INSTRUCTIONS INCLUDED IN THIS LETTER OF
TRANSMITTAL MUST BE FOLLOWED. QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR
ADDITIONAL COPIES OF THE PROSPECTUS, THIS LETTER OF TRANSMITTAL AND THE NOTICE
OF GUARANTEED DELIVERY MAY BE DIRECTED TO THE EXCHANGE AGENT. SEE INSTRUCTION
12.
 
    HOLDERS WHO WISH TO ACCEPT THE EXCHANGE OFFER AND TENDER THEIR RESTRICTED
NOTES MUST COMPLETE THIS LETTER OF TRANSMITTAL IN ITS ENTIRETY AND COMPLY WITH
ALL OF ITS TERMS.
 
    List below the Restricted Notes to which this Letter of Transmittal relates.
If the space provided below is inadequate, the Certificate Numbers and Principal
Amounts should be listed on a separate signed schedule, attached hereto. The
minimum permitted tender is $1,000 in principal amount of the Restricted Notes.
All other tenders must be in integral multiples of $1,000.
 
<TABLE>
<CAPTION>
 ----------------------------------------------------------------------------------------------------
 
- ----------------------------------------------------------------------------------------------------
           DESCRIPTION OF RESTRICTED NOTES                    1               2               3
- ------------------------------------------------------------------------------------------------------
                                                                                          PRINCIPAL
                                                                          AGGREGATE       AMOUNT OF
                                                                          PRINCIPAL       RESTRICTED
   NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S):      CERTIFICATE      AMOUNT OF         NOTES
              (PLEASE FILL IN, IF BLANK)                  NUMBER(S)*        NOTES         TENDERED**
- ------------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>
 
                                                        ----------------------------------------------
                                                        Total
- ----------------------------------------------------------------------------------------------------
 
 *   Need not be completed by book-entry holders.
 **  Need not be completed by Holders who wish to tender all Restricted Notes listed.
- ----------------------------------------------------------------------------------------------------
</TABLE>
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
              PLEASE READ CAREFULLY THE ACCOMPANYING INSTRUCTIONS
 
                       SPECIAL REGISTRATION INSTRUCTIONS
                         (SEE INSTRUCTIONS 4, 5 AND 6)
 
      To be completed ONLY if certificates for Restricted Notes in a principal
  amount not tendered, or Exchange Notes issued in exchange for Restricted
  Notes accepted for exchange, are to be issued in the name of someone other
  than the undersigned.
 
  Issue certificate(s) to:
 
  Name(s) ____________________________________________________________________
  Address ____________________________________________________________________
                                (INCLUDE ZIP CODE)
 
   __________________________________________________________________________
   (TAX IDENTIFICATION OR SOCIAL
   SECURITY NUMBER(S))
   -------------------------------------------------------------------
   -------------------------------------------------------------------
 
                         SPECIAL DELIVERY INSTRUCTIONS
                         (SEE INSTRUCTIONS 4, 5 AND 6)
 
      To be completed ONLY if certificates for Restricted Notes in a principal
  amouint not tendered, or Exchange Notes issued in exchange for Restricted
  Notes accepted for exchange, are to be delivered to someone other than the
  undersigned.
 
  Deliver certificate(s) to:
 
  Name(s) ____________________________________________________________________
 
  Address ____________________________________________________________________
 
                                (INCLUDE ZIP CODE)
 
   __________________________________________________________________________
   (TAX IDENTIFICATION OR SOCIAL
   SECURITY NUMBER(S))
- -------------------------------------------------------------
 
IMPORTANT: THIS LETTER OF TRANSMITTAL OR A FACSIMILE HEREOF (TOGETHER WITH THE
CERTIFICATE(S) FOR RESTRICTED NOTES AND ALL OTHER REQUIRED DOCUMENTS) OR A
CONFIRMATION OF BOOK-ENTRY TRANSFER AND AGENT'S MESSAGE OF SUCH RESTRICTED NOTES
MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE. IF
GUARANTEED DELIVERY PROCEDURES ARE TO BE COMPLIED WITH, A NOTICE OF GUARANTEED
DELIVERY MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO THE EXPIRATION DATE.
 
<TABLE>
<S>        <C>
Holders whose Restricted Notes are not immediately available or who cannot deliver their Restricted Notes
and all other documents required hereby to the Exchange Agent on or prior to the Expiration Date may tender
their Restricted Notes according to the guaranteed delivery procedures set forth in the prospectus under the
caption "The Exchange Offer--Guaranteed Delivery Procedures." (See Instruction 2.)
 
/ /        CHECK HERE IF RESTRICTED NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE OF GUARANTEED DELIVERY
           PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE THE FOLLOWING:
           Name(s) of tendering Holder(s)
           Date of Execution of Notice of Guaranteed Delivery
           Name of Institution which Guarantees Delivery
           Transaction Code Number
 
/ /        CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL COPIES OF THE PROSPECTUS
           AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS THERETO.
 
           Name:
 
           Address:
</TABLE>
 
                                       3
<PAGE>
If the undersigned is not a broker-dealer, the undersigned represents that (1)
it is acquiring the Exchange Notes in the ordinary course of its business, (2)
it has no arrangements or understanding with any person, nor does it intend to
engage in, a distribution (as that term is interpreted by the SEC) of Exchange
Notes and (3) it is not an affiliate (as that term is interpreted by the SEC) of
the Company. If the undersigned is a broker-dealer that will receive Exchange
Notes for its own account in exchange for Restricted Notes that were acquired as
a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such Exchange Notes; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.
 
NOTE: SIGNATURES MUST BE PROVIDED BELOW.
PLEASE READ ACCOMPANYING INSTRUCTIONS CAREFULLY.
 
Ladies and Gentlemen:
 
    Subject to the terms and conditions of the Exchange Offer, the undersigned
hereby tenders to Tyco International Group S.A. (the "Company") the principal
amount of Restricted Notes indicated above.
 
    Subject to and effective upon the acceptance for exchange of the principal
amount of Restricted Notes tendered hereby in accordance with the terms of the
Exchange Offer described in the prospectus, this Letter of Transmittal and the
accompanying Instructions, the undersigned sells, assigns and transfers to, or
upon the order of, the Company all right, title and interest in and to the
Restricted Notes tendered hereby. The undersigned hereby irrevocably constitutes
and appoints the Exchange Agent as its agent and attorney-in-fact (with full
knowledge that the Exchange Agent also acts as the agent of the Company and as
Trustee and Registrar under the Indenture for the Restricted Notes and the
Exchange Notes) with respect to the tendered Restricted Notes with full power of
substitution (such power of attorney being deemed an irrevocable power coupled
with an interest), subject only to the right of withdrawal described in the
Prospectus, to (1) deliver certificates for such Restricted Notes to the Company
or transfer ownership of such Restricted Notes on the account books maintained
by DTC, together, in either such case, with all accompanying evidences of
transfer and authenticity to, or upon the order of, the Company and (2) present
such Restricted Notes for transfer on the books of the Company and receive all
benefits and otherwise exercise all rights of beneficial ownership of such
Restricted Notes, all in accordance with the terms of the Exchange Offer.
 
    The undersigned acknowledges that the Exchange Offer is being made in
reliance upon interpretative advice given by the staff of the SEC to third
parties in connection with transactions similar to the Exchange Offer, so that
the Exchange Notes issued pursuant to the Exchange Offer in exchange for the
Restricted Notes may be offered for resale, resold and otherwise transferred by
holders thereof (other than a broker-dealer who purchased such Restricted Notes
directly from the Company for resale pursuant to Rule 144A, Regulation S or any
other available exemption under the Securities Act or a person that is an
"affiliate" of the Company within the meaning of Rule 405 under the Securities
Act) without compliance with the registration and prospectus delivery provisions
of the Securities Act, provided that such Exchange Notes are acquired by
non-affiliates of the Company in the ordinary course of such holders' business
and such holders are not participating, do not intend to participate and have no
arrangement or understanding with any person to participate, in the distribution
of such Exchange Notes.
 
    The undersigned agrees that acceptance of any tendered Restricted Notes by
the Company and the issuance of Exchange Notes in exchange therefor shall
constitute performance in full by the Company of its obligations under the
Exchange Offer and Registration Rights Agreement and that, upon the issuance of
the Exchange Notes, the Company will have no further obligations or liabilities
thereunder (except in certain limited circumstances).
 
    The undersigned represents and warrants that (1) the Exchange Notes acquired
pursuant to the Exchange Offer are being acquired in the ordinary course of
business of the person receiving Exchange Notes (which shall be the undersigned
unless otherwise indicated in the box entitled "Special Delivery Instructions"
above) (the "Recipient"), (2) neither the undersigned nor the Recipient (if
different) is engaged in, intends to engage in or has any arrangement or
understanding with any person to participate in the distribution (as that term
is interpreted by the SEC) of such Exchange Notes, and (3) neither the
undersigned nor the Recipient (if different) is an "affiliate" of the Company as
defined in Rule 405 under the Securities Act.
 
    If the undersigned is a broker-dealer, the undersigned further (1)
represents that it acquired Restricted Notes for the undersigned's own account
as a result of market-making activities or other trading activities, (2)
represents that it has not entered into any arrangement or understanding with
the Company or any "affiliate" of the Company (within the meaning of Rule 405
under the Securities Act) to distribute the Exchange Notes to be received in the
Exchange Offer and (3) acknowledges that it will deliver a prospectus meeting
the requirements of the Securities Act (for which purposes, the delivery of the
Prospectus, as the same may be hereafter supplemented or amended, shall be
sufficient) in connection with any resale of Exchange Notes received in the
Exchange Offer. Such a broker-dealer will not be deemed, solely by reason of
such acknowledgment and prospectus delivery, to admit that it is an
"underwriter" within the meaning of the Securities Act.
 
                                       4
<PAGE>
    The undersigned understands and agrees that the Company reserves the right
not to accept tendered Restricted Notes from any tendering holder if the Company
determines, in its sole and absolute discretion, that such acceptance could
result in a violation of applicable securities laws.
 
    The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, exchange, assign and transfer the Restricted
Notes tendered hereby and to acquire Exchange Notes issuable upon the exchange
of such tendered Restricted Notes, and that, when the same are accepted for
exchange, the Company will acquire good and unencumbered title thereto, free and
clear of all liens, restrictions, charges and encumbrances and not subject to
any adverse claim. The undersigned also warrants that it will, upon request,
execute and deliver any additional documents deemed to be necessary or desirable
by the Exchange Agent or the Company in order to complete the exchange,
assignment and transfer of tendered Restricted Notes or transfer of ownership of
such Restricted Notes on the account books maintained by a book-entry transfer
facility.
 
    The undersigned understands and acknowledges that the Company reserves the
right in its sole discretion to purchase or make offers for any Restricted Notes
that remain outstanding subsequent to the Expiration Date or, as set forth in
the Prospectus under the caption "Exchange Offer--Procedures for Tendering," to
terminate the Exchange Offer and, to the extent permitted by applicable law,
purchase Restricted Notes in the open market, in privately negotiated
transactions or otherwise. The terms of any such purchases or offers could
differ from the terms of the Exchange Offer.
 
    The undersigned understands that the Company may accept the undersigned's
tender by delivering written notice of acceptance to the Exchange Agent, at
which time the undersigned's right to withdraw such tender will terminate. For
purposes of the Exchange Offer, the Company shall be deemed to have accepted
validly tendered Restricted Notes when, as and if the Company has given oral
(which shall be confirmed in writing) or written notice thereof to the Exchange
Agent.
 
    The undersigned understands that the first interest payment following the
Expiration Date will include unpaid interest on the Restricted Notes accrued
through the date of issuance of the Exchange Notes.
 
    The undersigned understands that tenders of Restricted Notes pursuant to the
procedures described under the caption "Exchange Offer--Procedures for
Tendering" in the Prospectus and in the instructions hereto will constitute a
binding agreement between the undersigned, the Company and the Exchange Agent in
accordance with the terms and subject to the conditions of the Exchange Offer.
 
    If any tendered Restricted Notes are not accepted for exchange pursuant to
the Exchange Offer for any reason, certificates for any such unaccepted
Restricted Notes will be returned, at the Company's cost and expense, to the
undersigned at the address shown below or at a different address as may be
indicated herein under "Special Delivery Instructions" as promptly as
practicable after the Expiration Date.
 
    All authority conferred or agreed to be conferred by this Letter of
Transmittal shall survive the death, incapacity or dissolution of the
undersigned, and every obligation of the undersigned under this Letter of
Transmittal shall be binding on the undersigned's heirs, personal
representatives, successors and assigns. This tender may be withdrawn only in
accordance with the procedures set forth in the prospectus and in this Letter of
Transmittal.
 
    By acceptance of the Exchange Offer, each broker-dealer that receives
Exchange Notes pursuant to the Exchange Offer hereby acknowledges and agrees
that upon the receipt of notice by the Company of the happening of any event
that makes any statement in the Prospectus untrue in any material respect or
that requires the making of any changes in the Prospectus in order to make the
statements therein not misleading (which notice the Company agrees to deliver
promptly to such broker-dealer), such broker-dealer will suspend use of the
Prospectus until the Company has amended or supplemented the Prospectus to
correct such misstatement or omission and has furnished copies of the amended or
supplemented prospectus to such broker-dealer.
 
    Unless otherwise indicated under "Special Registration Instructions," please
issue the certificates representing the Exchange Notes issued in exchange for
the Restricted Notes accepted for exchange and return any certificates for
Restricted Notes not tendered or not exchanged, in the name(s) of the
undersigned. Similarly, unless otherwise indicated under "Special Delivery
Instructions," please send the certificates representing the Exchange Notes
issued in exchange for the Restricted Notes accepted for exchange and any
certificates for Restricted Notes not tendered or not exchanged (and
accompanying documents, as appropriate) to the undersigned at the address shown
below the undersigned's signature(s). In the event that both "Special
Registration Instructions" and "Special Delivery Instructions" are completed,
please issue the certificates representing the Exchange Notes issued in exchange
for the Restricted Notes accepted for exchange in the name(s) of, and return any
certificates for Restricted Notes not tendered or not exchanged to, the
person(s) so indicated. The undersigned understands that the Company has no
obligations pursuant to the "Special Registration Instructions" or "Special
Delivery Instructions" to transfer any Restricted Notes from the name of the
registered Holder(s) thereof if the Company does not accept for exchange any of
the Restricted Notes so tendered.
 
                                       5
<PAGE>
    Holders who wish to tender the Restricted Notes and (1) whose Restricted
Notes are not immediately available or (2) who cannot deliver their Restricted
Notes, this Letter of Transmittal or any other documents required hereby to the
Exchange Agent prior to the Expiration Date, may tender their Restricted Notes
according to the guaranteed delivery procedures set forth in the Prospectus
under the caption "Exchange Offer--Guaranteed Delivery Procedures." (See
Instruction 2.)
 
- --------------------------------------------------------------------------------
 
     PLEASE SIGN HERE WHETHER OR NOT RESTRICTED NOTES ARE BEING PHYSICALLY
      TENDERED HEREBY AND WHETHER OR NOT TENDER IS TO BE MADE PURSUANT TO
                       THE GUARANTEED DELIVERY PROCEDURES
                  (PLEASE COMPLETE SUBSTITUTE FORM W-9 HEREIN)
 
      This Letter of Transmittal must be signed by the registered holder(s) as
  its (their) name(s) appear on the Restricted Notes or by person(s)
  authorized to become registered holder(s) by a properly completed bond power
  from the registered holder(s), a copy of which must be transmitted with this
  Letter of Transmittal. If Restricted Notes to which this Letter of
  Transmittal relate are held of record by two or more joint holders, then all
  such holders must sign this Letter of Transmittal. If the signature is by a
  trustee, executor, administrator, guardian, attorney-in-fact, officer of a
  corporation or other person acting in a fiduciary or representative
  capacity, then such person must (1) set forth his or her full title below
  and (2) unless waived by the Company, submit evidence satisfactory to the
  Company of such person's authority so to act. (See Instruction 4.)
 
        ----------------------------------------------------------------
 
                          (SIGNATURE(S) OF HOLDER(S))
 
  Date: ____________, 1999
  Name(s) ____________________________________________________________________
                                 (PLEASE PRINT)
 
  Capacity (full title) ______________________________________________________
  Address ____________________________________________________________________
                               (INCLUDE ZIP CODE)
 
  Area Code and Telephone Number (   )________________________________________
  ____________________________________________________________________________
               (TAX IDENTIFICATION OR SOCIAL SECURITY NUMBER(S))
 
- --------------------------------------------------------------------------------
 
- --------------------------------------------------------------------------------
 
                           GUARANTEE OF SIGNATURE(S)
                              (SEE INSTRUCTION 1)
 
        ----------------------------------------------------------------
 
                             (AUTHORIZED SIGNATURE)
 
  Date: ____________, 1999
  Name of Firm _______________________________________________________________
  Capacity (full title) ______________________________________________________
  Address ____________________________________________________________________
                               (INCLUDE ZIP CODE)
 
  Area Code and Telephone Number (   )________________________________________
- --------------------------------------------------------------------------------
 
                                       6
<PAGE>
                                  INSTRUCTIONS
         FORMING PART OF THE TERMS AND CONDITIONS OF THE EXCHANGE OFFER
 
    1. GUARANTEE OF SIGNATURES. Signatures on this Letter of Transmittal need
not be guaranteed if (a) this Letter of Transmittal is signed by the registered
holder(s) of the Restricted Notes tendered herewith and such holder(s) have not
completed the box set forth herein entitled "Special Registration Instructions"
or the box entitled "Special Delivery Instructions" or (b) such Restricted Notes
are tendered for the account of a member firm of a registered national
securities exchange or of the National Association of Securities Dealers, Inc.
or a commercial bank or trust company having an office or correspondent in the
United States (each, an "Eligible Institution"). (See Instruction 6.) Otherwise,
all signatures on this Letter of Transmittal or a notice of withdrawal, as the
case may be, must be guaranteed by an Eligible Institution. All signatures on
bond powers and endorsements on certificates must also be guaranteed by an
Eligible Institution.
 
    2. DELIVERY OF THIS LETTER OF TRANSMITTAL AND RESTRICTED NOTES. Certificates
for all physically delivered Restricted Notes or confirmation of any book-entry
transfer to the Exchange Agent at DTC of Restricted Notes tendered by book-entry
transfer, as well as, in the case of physical delivery of Restricted Notes, a
properly completed and duly executed copy of this Letter of Transmittal or
facsimile hereof and any other documents required by this Letter of Transmittal,
must be received by the Exchange Agent at its address set forth herein prior to
5:00 p.m. New York City time on the Expiration Date. The method of delivery of
the tendered Restricted Notes, this Letter of Transmittal and all other required
documents, or book-entry transfer and transmission of an Agent's Message by a
DTC participant, to the Exchange Agent is at the election and risk of the Holder
and the delivery will be deemed made only when actually received by the Exchange
Agent. If Restricted Notes are sent by mail, registered mail with return receipt
requested, properly insured, is recommended. In all cases, sufficient time
should be allowed to ensure timely delivery. No Letter of Transmittal or
Restricted Notes should be sent to the Company or the Depositary Trust Company.
 
    The Exchange Agent will make a request to establish an account with respect
to the Restricted Notes at DTC for purposes of the Exchange Offer promptly after
receipt of this Prospectus, and any financial institution that is a participant
in DTC may make book-entry delivery of Restricted Notes by causing DTC to
transfer such Restricted Notes into the Exchange Agent's account at DTC in
accordance with DTC's procedures for transfer. However, although delivery of
Restricted Notes may be effected through book-entry transfer at DTC, an Agent's
Message (as defined in the next paragraph) in connection with a book-entry
transfer and any other required documents, must, in any case, be transmitted to
and received by the Exchange Agent at the address specified on the cover page of
the Letter of Transmittal on or prior to the Expiration Date or the guaranteed
delivery procedures described below must be complied with.
 
    A Holder may tender Restricted Notes that are held through DTC by
transmitting its acceptance through DTC's Automatic Tender Offer Program, for
which the transaction will be eligible, and DTC will then edit and verify the
acceptance and send an Agent's Message to the Exchange Agent for its acceptance.
The term "Agent's Message" means a message transmitted by DTC to, and received
by, the Exchange Agent and forming part of the Book-Entry Confirmation, which
states that DTC has received an express acknowledgment from each participant in
DTC tendering the Restricted Notes and that such participant has received the
Letter of Transmittal and agrees to be bound by the terms of the Letter of
Transmittal and the Company may enforce such agreement against such participant.
Delivery of an Agent's Message will also constitute an acknowledgment from the
tendering DTC participant that the representations and warranties set forth on
page 4 of this Letter of Transmittal are true and correct.
 
    Holders who wish to tender their Restricted Notes and (1) whose Restricted
Notes are not immediately available, or (2) who cannot deliver their Restricted
Notes, this Letter of Transmittal or any other documents required hereby to the
Exchange Agent prior to the Expiration Date or comply with book-entry transfer
procedures on a timely basis must tender their Restricted Notes according to the
guaranteed delivery procedures set forth in the Prospectus. See "Exchange
Offer--Guaranteed Delivery Procedures." Pursuant to such procedure: (1) such
tender must be made by or through an Eligible Institution; (2) prior to the
Expiration Date, the Exchange Agent must have received from the Eligible
Institution a properly completed and duly executed Notice of Guaranteed Delivery
(by facsimile transmission, overnight courier, mail or hand delivery) setting
forth the name and address of the Holder of the Restricted Notes, the
certificate number or numbers of such Restricted Notes and the principal amount
of Restricted Notes tendered, stating that the tender is being made thereby and
guaranteeing that, within three New York Stock Exchange trading days after the
Expiration Date, this Letter of Transmittal (or facsimile hereof) or any Agent's
Message together with the certificate(s) representing the Restricted Notes or
book-entry transfer, as the case may be, and any other required documents will
be deposited by the Eligible Institution with the Exchange Agent; and (3) such
properly completed and executed Letter of Transmittal (or facsimile hereof), as
well as all other documents required by this Letter of
 
                                       7
<PAGE>
Transmittal and the certificate(s) representing all tendered Restricted Notes in
proper form for transfer (or a confirmation of book-entry transfer of such
Restricted Notes into the Exchange Agent's account at DTC), must be received by
the Exchange Agent within three New York Stock Exchange trading days after the
Expiration Date, all in the manner provided in the Prospectus under the caption
"The Exchange Offer--Guaranteed Delivery Procedures." Any Holder who wishes to
tender his, her or its Restricted Notes pursuant to the guaranteed delivery
procedures described above must ensure that the Exchange Agent receives the
Notice of Guaranteed Delivery prior to 5:00 p.m. New York City time on the
Expiration Date. Upon request to the Exchange Agent, a Notice of Guaranteed
Delivery will be sent to Holders who wish to tender their Restricted Notes
according to the guaranteed delivery procedures set forth above.
 
    All questions as to the validity, form, eligibility (including time of
receipt), acceptance of tendered Restricted Notes, and withdrawal of tendered
Restricted Notes will be determined by the Company in its sole discretion, which
determination will be final and binding. All tendering holders, by execution of
this Letter of Transmittal (or facsimile thereof), shall waive any right to
receive notice of the acceptance of the Restricted Notes for exchange. The
Company reserves the absolute right to reject any and all Restricted Notes not
properly tendered or any Restricted Notes the Company's acceptance of which
would, in the opinion of counsel for the Company, be unlawful. The Company also
reserves the right to waive any irregularities or conditions of tender as to
particular Restricted Notes. The Company's interpretation of the terms and
conditions of the Exchange Offer (including the instructions in this Letter of
Transmittal) shall be final and binding on all parties. Unless waived, any
defects or irregularities in connection with tenders of Restricted Notes must be
cured within such time as the Company shall determine. Neither the Company, the
Exchange Agent nor any other person shall be under any duty to give notification
of defects or irregularities with respect to tenders of Restricted Notes, nor
shall any of them incur any liability for failure to give such notification.
Tenders of Restricted Notes will not be deemed to have been made until such
defects or irregularities have been cured to the Company's satisfaction or
waived. Any Restricted Notes received by the Exchange Agent that are not
properly tendered and as to which the defects or irregularities have not been
cured or waived will be returned by the Exchange Agent to the tendering Holders
pursuant to the Company's determination, unless otherwise provided in this
Letter of Transmittal as soon as practicable following the Expiration Date.
 
    3. INADEQUATE SPACE. If the space provided is inadequate, the certificate
numbers and/or the number of Restricted Notes should be listed on a separate
signed schedule attached hereto.
 
    4. TENDER BY HOLDER. Only a registered Holder of Restricted Notes or a DTC
participant listed on a securities position listing furnished by DTC with
respect to the Restricted Notes may tender its Restricted Notes in the Exchange
Offer. Any beneficial owner of Restricted Notes who is not the registered Holder
and is not a DTC participant and who wishes to tender should arrange with such
registered holder to execute and deliver this Letter of Transmittal on such
beneficial owner's behalf or must, prior to completing and executing this Letter
of Transmittal and delivering his, her or its Restricted Notes, either make
appropriate arrangements to register ownership of the Restricted Notes in such
beneficial owner's name or obtain a properly completed bond power from the
registered holder or properly endorsed certificates representing such Restricted
Notes.
 
    5. PARTIAL TENDERS; WITHDRAWALS. Tenders of Restricted Notes will be
accepted only in integral multiples of $1,000. If less than the entire principal
amount of any Restricted Notes is tendered, the tendering Holder should fill in
the principal amount tendered in the third column of the box entitled
"Description of Restricted Notes" above. The entire principal amount of any
Restricted Notes delivered to the Exchange Agent will be deemed to have been
tendered unless otherwise indicated. If the entire principal amount of all
Restricted Notes is not tendered, then Restricted Notes for the principal amount
of Restricted Notes not tendered and a certificate or certification representing
Exchange Notes issued in exchange for any Restricted Notes accepted will be sent
to the Holder at his, her or its registered address, unless a different address
is provided in the "Special Delivery Instructions" box above on this Letter of
Transmittal or unless tender is made through DTC, promptly after the Restricted
Notes are accepted for exchange.
 
    Except as otherwise provided herein, tenders of Restricted Notes may be
withdrawn at any time prior to the Expiration Date. To withdraw a tender of
Restricted Notes in the Exchange Offer, a written or facsimile transmission
notice of withdrawal must be received by the Exchange Agent at its address set
forth herein prior to the Expiration Date. Any such notice of withdrawal must
(1) specify the name of the person having deposited the Restricted Notes to be
withdrawn (the "Depositor"), (2) identify the Restricted Notes to be withdrawn
(including the certificate number or numbers and principal amount of such
Restricted Notes, or, in the case of Restricted Notes transferred by book-entry
transfer the name and number of the account at DTC to be credited), (3) be
signed by the Depositor in the same manner as the original signature on the
Letter of Transmittal by which such Restricted Notes were tendered (including
any required signature guarantees) or be accompanied by documents of transfer
sufficient to have the Registrar with respect to the Restricted Notes register
the transfer of such Restricted Notes into the name of the
 
                                       8
<PAGE>
person withdrawing the tender and (4) specify the name in which any such
Restricted Notes are to be registered, if different from that of the Depositor.
All questions as to the validity, form and eligibility (including time of
receipt) of such notices will be determined by the Company, whose determination
shall be final and binding on all parties. Any Restricted Notes so withdrawn
will be deemed not to have been validly tendered for purposes of the Exchange
Offer and no Exchange Notes will be issued with respect thereto unless the
Restricted Notes so withdrawn are validly retendered. Any Restricted Notes which
have been tendered but which are not accepted for exchange by the Company will
be returned to the Holder thereof without cost to such Holder as soon as
practicable after withdrawal, rejection of tender or termination of the Exchange
Offer. Properly withdrawn Restricted Notes may be retendered by following one of
the procedures described in the Prospectus under "Exchange Offer--Procedures for
Tendering" at any time prior to the Expiration Date.
 
    6. SIGNATURES ON THE LETTER OF TRANSMITTAL; BOND POWERS AND ENDORSEMENTS. If
this Letter of Transmittal (or facsimile hereof) is signed by the registered
Holder(s) of the Restricted Notes tendered hereby, the signature must correspond
with the name(s) as written on the face of the Restricted Note without
alteration, enlargement or any change whatsoever.
 
    If any of the Restricted Notes tendered hereby are owned of record by two or
more joint owners, all such owners must sign this Letter of Transmittal.
 
    If a number of Restricted Notes registered in different names are tendered,
it will be necessary to complete, sign and submit as many copies of this Letter
of Transmittal as there are different registrations of Restricted Notes.
 
    If this Letter of Transmittal (or facsimile hereof) is signed by the
registered Holder or Holders (which term, for the purposes described herein,
shall include a book-entry transfer facility whose name appears on a security
listing as the owner of the Restricted Notes) of Restricted Notes tendered and
the certificate or certificates for Exchange Notes issued in exchange therefor
is to be issued (or any untendered principal amount of Restricted Notes to be
reissued) to the registered Holder, then such Holder need not and should not
endorse any tendered Restricted Notes, nor provide a separate bond power. In any
other case, such Holder must either properly endorse the Restricted Notes
tendered or transmit a properly completed separate bond power with this Letter
of Transmittal with the signatures on the endorsement or bond power guaranteed
by an Eligible Institution.
 
    If this Letter of Transmittal (or facsimile hereof) is signed by a person
other than the registered Holder or Holders of any Restricted Notes listed, such
Restricted Notes must be endorsed or accompanied by appropriate bond powers in
each case signed as the name of the registered Holder or Holders appears on the
Restricted Notes.
 
    If this Letter of Transmittal (or facsimile hereof) or any Restricted Notes
or bond powers are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, or officers of corporations or others acting in a fiduciary
or representative capacity, such persons should so indicate when signing, and
unless waived by the Company, evidence satisfactory to the Company of their
authority so to act must be submitted with this Letter of Transmittal.
 
    Endorsements on Restricted Notes or signatures on bond powers required by
this Instruction 6 must be guaranteed by an Eligible Institution.
 
    7. SPECIAL REGISTRATION AND DELIVERY INSTRUCTIONS. Tendering Holders should
indicate, in the applicable box or boxes, the name and address to which Exchange
Notes or substitute Restricted Notes for principal amounts not tendered or not
accepted for exchange are to be issued or sent, if different from the name and
address of the person signing this Letter of Transmittal. In the case of
issuance in a different name, the taxpayer identification or social security
number of the person named must also be indicated.
 
    8. BACKUP UNITED STATES FEDERAL INCOME TAX WITHHOLDING AND SUBSTITUTE FORM
W-9. Under the United States federal income tax laws, payments that may be made
by the Company on account of Exchange Notes issued pursuant to the Exchange
Offer may be subject to backup withholding at the rate of 31%. In order to avoid
such backup withholding, each tendering holder should complete and sign the
Substitute Form W-9 included in this Letter of Transmittal and either (a)
provide the correct taxpayer identification number ("TIN") and certify, under
penalties of perjury, that the TIN provided is correct and that (1) the Holder
has not been notified by the United States Internal Revenue Service the ("IRS")
that the Holder is subject to backup withholding as a result of failure to
report all interest or dividends or (2) the IRS has notified the Holder that the
Holder is no longer subject to backup withholding; or (b) provide an adequate
basis for exemption. If the tendering Holder has not been issued a TIN and has
applied for one, or intends to apply for one in the near future, such Holder
should write "Applied For" in the space provided for the TIN in Part I of the
Substitute Form W-9, sign and date the Substitute Form W-9 and sign the
Certificate of Payee Awaiting Taxpayer Identification Number. If "Applied For"
is written in Part I, the Company (or the Paying Agent under the Indenture
governing the Exchange Notes) shall retain 31% of payments made to the tendering
Holder during the 60-day period following the date of the Substitute Form W-9.
If the Holder furnishes his,
 
                                       9
<PAGE>
here or its TIN within 60 days after the date of the Substitute Form W-9, the
Company (or the Paying Agent) shall remit such amounts retained during the
60-day period to the Holder and no further amounts shall be retained or withheld
from payments made to the Holder thereafter. If, however, the Holder has not
provided the Exchange Agent or the Company with his, her or its TIN within such
60-day period, the Company (or the Paying Agent) shall remit such previously
retained amounts to the IRS as backup withholding. In general, if a Holder is an
individual, the TIN is the social security number of such individual. If the
Exchange Agent or the Company are not provided with the correct TIN, the Holder
may be subject to a $50 penalty imposed by the IRS.
 
    Certain Holders (including, among others, all corporations and certain
non-United States individuals) are not subject to these backup withholding and
reporting requirements. In order for a non-United States individual to qualify
as an exempt recipient, such Holder must submit a statement (generally, IRS Form
W-8), signed under penalties of perjury, attesting to that individual's exempt
status. Such statements can be obtained from the Exchange Agent. For further
information concerning backup withholding and instructions for completing the
Substitute Form W-9 (including how to obtain a taxpayer identification number if
you do not have one and how to complete the Substitute Form W-9 if Restricted
Notes are registered in more than one name), consult the enclosed Guidelines for
Certification of Taxpayer Identification Number on Substitute Form W-9. Failure
to complete the Substitute Form W-9 will not, by itself, cause Restricted Notes
to be deemed invalidly tendered, but may require the Company (or the Paying
Agent) to withhold 31% of the amount of any payments made on account of the
Exchange Notes. Backup withholding is not an additional federal income tax.
Rather, the federal income tax liability of a person subject to backup
withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained from the IRS.
 
    9. TRANSFER TAXES. The Company will pay all transfer taxes, if any,
applicable to the exchange of Restricted Notes pursuant to the Exchange Offer.
If, however, certificates representing Exchange Notes or Restricted Notes for
principal amounts not tendered or accepted for exchange are to be delivered to,
or are to be registered in the name of, any person other than the registered
Holder of the Restricted Notes tendered hereby, or if tendered Restricted Notes
are registered in the name of a person other than the person signing this Letter
of Transmittal, or if a transfer tax is imposed for any reason other than the
exchange of Restricted Notes pursuant to the Exchange Offer, then the amount of
any such transfer taxes (whether imposed on the registered Holder or on any
other persons) will be payable by the tendering Holder. If satisfactory evidence
of payment of such taxes or exemption therefrom is not submitted with this
Letter of Transmittal, the amount of such transfer taxes will be billed directly
to such tendering Holder. See the Prospectus under "Exchange Offer--Solicitation
of Tenders; Fees and Expenses."
 
    Except as provided in this Instruction 9, it will not be necessary for
transfer tax stamps to be affixed to the Restricted Notes listed in this Letter
of Transmittal.
 
    10. WAIVER OF CONDITIONS. The Company reserves the right, in its sole
discretion, to amend, waive or modify specified conditions in the Exchange Offer
in the case of any Restricted Notes tendered.
 
    11. MUTILATED, LOST, STOLEN OR DESTROYED RESTRICTED NOTES. Any tendering
Holder whose Restricted Notes have been mutilated, lost, stolen or destroyed
should contact the Exchange Agent at the address indicated herein for further
instructions.
 
    12. REQUESTS FOR ASSISTANCE, COPIES. Requests for assistance and requests
for additional copies of the Prospectus or this Letter of Transmittal may be
directed to the Exchange Agent at the address specified in the Prospectus.
Holders may also contact their broker, dealer, commercial bank, trust company or
other nominee for assistance concerning the Exchange Offer.
 
                         (DO NOT WRITE IN SPACE BELOW)
 
<TABLE>
<CAPTION>
          CERTIFICATE TENDERED                   RESTRICTED NOTES ACCEPTED                RESTRICTED NOTES SURRENDERED
- ----------------------------------------  ----------------------------------------  ----------------------------------------
<S>                                       <C>                                       <C>
 
- ----------------------------------------  ----------------------------------------  ----------------------------------------
 
- ----------------------------------------  ----------------------------------------  ----------------------------------------
</TABLE>
 
Received _________ Accepted by _________ Checked by _________
Delivery Prepared by ________ Checked by ________ Date ________
 
                                       10
<PAGE>
                           IMPORTANT TAX INFORMATION
 
    Under United States federal income tax laws, to avoid imposition of a 31%
backup withholding with respect to payments made under the Exchange Notes a
Holder whose tendered Restricted Notes are accepted for payment should provide
the Exchange Agent with such Holder's correct TIN on Substitute Form W-9 below
or otherwise establish a basis for exemption from backup withholding. If such
Holder is an individual, the TIN is his social security number. If the Exchange
Agent is not provided with the correct TIN, a $50 penalty may be imposed by the
Internal Revenue Service, and payments made under the Exchange Note may be
subject to backup withholding.
 
    Certain Holders (including, among others, all corporations and certain
non-United States persons) are not subject to these backup withholding and
reporting requirements. Exempt Holders should indicate their exempt status on
Substitute Form W-9. A non-United States person may qualify as an exempt
recipient by submitting to the Exchange Agent a properly completed Internal
Revenue Service Form W-8, signed under penalties of perjury, attesting to that
Holder's exempt status. A Form W-8 can be obtained from the Exchange Agent. See
the enclosed "Guidelines for Certification of Taxpayer Identification Number on
Substitute Form W-9" for additional instructions.
 
    If backup withholding applies, the Company (or the Paying Agent under the
Indenture governing the Exchange Notes) is required to withhold 31% of any
payments made to the Holder or other payee with respect to the Exchange Notes.
Backup withholding is not an additional United States federal income tax.
Rather, the United States federal income tax liability of persons subject to
backup withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained from the Internal
Revenue Service.
 
PURPOSE OF SUBSTITUTE FORM W-9
 
    To prevent backup withholding on payments made with respect to the Exchange
Notes, the Holder should provide the Company (or the Paying Agent under the
Indenture governing the Exchange Notes) with either (a) the Holder's correct TIN
by completing the form below, certifying that the TIN provided on Substitute
Form W-9 is correct (or that such Holder is awaiting a TIN) and that (1) the
Holder has not been notified by the Internal Revenue Service that the Holder is
subject to backup withholding as a result of failure to report all interest or
dividends or (2) the Internal Revenue Service has notified the Holder that the
Holder is no longer subject to backup withholding or (b) an adequate basis for
exemption.
 
WHAT NUMBER TO GIVE
 
    The Holder is required to give the TIN (e.g., social security number or
employer identification number) of the registered Holder of the Restricted
Notes. If the Restricted Notes are held in more than one name or are held not in
the name of the actual owner, consult the enclosed "Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9" for additional
guidance on which number to report.
 
YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX
  IN PART 2 OF SUBSTITUTE FORM W-9
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
 I certify, under penalties of perjury, that a Taxpayer Identification Number
 has not been issued to me, and that I mailed or delivered an application to
 receive a Taxpayer Identification Number to the appropriate Internal Revenue
 Service Center or Social Security Administration Office (or I intend to mail
 or deliver an application in the near future). I understand that if I do not
 provide a Taxpayer Identification Number to the payer, 31% of all payments
 made to me on account of the Exchange Notes shall be retained until I provide
 a Taxpayer Identification Number within 60 days, such retained amounts shall
 be remitted to the Internal Revenue Service as backup withholding and 31% of
 all reportable payments made to me thereafter will be withheld and remitted to
 the Internal Revenue Service until I provide a Taxpayer Identification Number.
 
 Signature
 ---------------------------------------------  Date
 -------------------------- ,1999
 
                                       11
<PAGE>
   IMPORTANT: THIS LETTER OF TRANSMITTAL (OR FACSIMILE THEREOF) AND ALL OTHER
           REQUIRED DOCUMENTS MUST BE RECEIVED BY THE EXCHANGE AGENT
                      ON OR PRIOR TO THE EXPIRATION DATE.
 
                    TO BE COMPLETED BY ALL TENDERING HOLDERS
 
                              (SEE INSTRUCTION 8)
 
<TABLE>
<S>                       <C>                                <C>
- -------------------------------------------------------------------------------------------
 PAYER'S NAME: [insert]
 ------------------------------------------------------------------------------------------
                          PART 1--PLEASE PROVIDE YOUR TIN    TIN: -------------------------
                          ON THE LINE AT RIGHT AND CERTIFY     Social Security Number or
                          BY SIGNING AND DATING BELOW        Employer Identification Number
 
                          -----------------------------------------------------------------
                          PART 2--TIN Applied For / /
 
                          -----------------------------------------------------------------
 SUBSTITUTE                CERTIFICATION--UNDER THE PENALTIES OF PERJURY, I CERTIFY THAT:
 
                           (1) the number shown on this form is my correct taxpayer
                           identification number (or I
                              am waiting for a number to be issued to me),
 FORM W-9                  (2) I am not subject to backup withholding either because (i) I
 Department of the         am exempt from backup withholding, (ii) I have not been notified
 Treasury                      by the Internal Revenue Service ("IRS") that I am subject to
 Internal Revenue
 Service                       backup withholding as a result of a failure to report all
 Payor's Request For           interest or dividends, or (iii) the IRS has notified me that
 Taxpayer Identification       I am no longer subject to backup withholding, and
 Number ("TIN") and
 Certification
 
                           (3) any other information provided on this form is true and
                               correct.
 
                           Signature                                 Date  , 1999
 You must cross out item (2) in the certification above if you have been notified by the
 IRS that you are subject to backup withholding because of underreporting interest or
 dividends on your tax return and you have not been notified by the IRS that you are no
 longer subject to backup withholding.
 
- -------------------------------------------------------------------------------------------
</TABLE>
 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY IN CERTAIN CIRCUMSTANCES
RESULT IN BACKUP WITHHOLDING OF 31% OF ANY AMOUNTS PAID TO YOU ON ACCOUNT OF THE
EXCHANGE NOTES. PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF
TAXPAYER IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
                                       12

<PAGE>
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                             5.875% NOTES DUE 2004
                                       OF
                         TYCO INTERNATIONAL GROUP S.A.
 
    As set forth in the prospectus dated February   , 1999 (the "Prospectus") of
Tyco International Group S.A. (the "Company") and Tyco International Ltd.
("Tyco") and in the Letter of Transmittal (the "Letter of Transmittal"), this
form or a form substantially equivalent to this form must be used to accept the
Exchange Offer (as defined below) if the certificates for the outstanding 5.875%
Notes due 2004 (the "Restricted Notes") of the Company and all other documents
required by the Letter of Transmittal cannot be delivered to the Exchange Agent
by the Expiration Date of the Exchange Offer or compliance with book-entry
transfer procedures cannot be effected on a timely basis. Such form may be
delivered by hand or transmitted by facsimile transmission, telex or mail to the
Exchange Agent no later than the Expiration Date, and must include a signature
guarantee by an Eligible Institution as set forth below. Capitalized terms used
herein but not defined herein have the meanings ascribed thereto in the
Prospectus.
 
                 The Exchange Agent for the Exchange Offer is:
                              The Bank Of New York
 
<TABLE>
<CAPTION>
BY REGISTERED OR CERTIFIED MAIL   FACSIMILE TRANSMISSIONS:   BY HAND OR OVERNIGHT DELIVERY
<S>                               <C>                       <C>
      The Bank of New York         (Eligible Institutions         The Bank of New York
     101 Barclay Street, 7E         Only) (212) 815-4699           101 Barclay Street
    New York, New York 10286       CONFIRM BY TELEPHONE:     CorporateTrustServices Window
     Attn: Denise Robinson             (212) 815-2791                 Ground Level
                                   FOR INFORMATION CALL:        New York, New York 10286
                                       (212) 815-2791            Attn: Denise Robinson
</TABLE>
 
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OR TRANSMISSION TO A FACSIMILE
NUMBER OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID DELIVERY. THE
METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING CERTIFICATES, IS AT THE RISK OF
THE HOLDER. IF DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT
REQUESTED, PROPERLY INSURED, IS RECOMMENDED. YOU SHOULD READ THE INSTRUCTIONS
ACCOMPANYING THE LETTER OF TRANSMITTAL CAREFULLY BEFORE YOU COMPLETE THIS NOTICE
OF GUARANTEED DELIVERY.
 
    This Notice of Guaranteed Delivery is not to be used to guarantee
signatures. If a signature on a Letter of Transmittal is required to be
guaranteed by an Eligible Institution under the instructions thereto, such
signatures must appear in the applicable space provided on the Letter of
Transmittal for Guarantee of Signature(s).
 
THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M.
NEW YORK CITY TIME ON MARCH   , 1999 UNLESS THE EXCHANGE OFFER IS EXTENDED.
<PAGE>
Ladies and Gentlemen:
 
    The undersigned acknowledges receipt of the Prospectus and the related
Letter of Transmittal which describes the Company's offer (the "Exchange Offer")
to exchange $1,000 in principal amount of its 5.875% Notes due 2004 (the
"Exchange Notes") for each $1,000 in principal amount of its 5.875% Notes due
2004 (the "Restricted Notes"). The undersigned hereby tenders to the Company the
aggregate principal amount of Restricted Notes set forth below on the terms and
conditions set forth in the Prospectus and the related Letter of Transmittal
pursuant to the guaranteed delivery procedure set forth in the "Exchange
Offer--Guaranteed Delivery Procedures" section in the Prospectus and the
accompanying Letter of Transmittal.
 
    The undersigned understands that no withdrawal of a tender of Restricted
Notes may be made on or after the Expiration Date. The undersigned understands
that for a withdrawal of a tender of Restricted Notes to be effective, a written
notice of withdrawal that complies with the requirements of the Exchange Offer
must be timely received by the Exchange Agent at one of its addresses or by
facsimile specified on the cover of this Notice of Guaranteed Delivery prior to
the Expiration Date.
 
    The undersigned understands that the exchange of Restricted Notes for
Exchange Notes pursuant to the Exchange Offer will be made only after timely
receipt by the Exchange Agent of (1) such Restricted Notes (or Book-Entry
Confirmation of the transfer of such Restricted Notes into the Exchange Agent's
account at The Depository Trust Company ("DTC")) and (2) if Restricted Notes are
to be physically delivered, a Letter of Transmittal (or facsimile thereof) with
respect to such Restricted Notes, properly completed and duly executed, with any
required signature guarantees, this Notice of Guaranteed Delivery and any other
documents required by the Letter of Transmittal or, in the case of book-entry
transfer, a properly transmitted Agent's Message. The term "Agent's Message"
means a message transmitted by DTC to, and received by, the Exchange Agent and
forming part of the confirmation of a book-entry transfer, which states that DTC
has received an express acknowledgment from a participant in DTC tendering the
Restricted Notes and that such participant has received the Letter of
Transmittal and agrees to be bound by the terms of the Letter of Transmittal and
the Company may enforce such agreement against such participant.
 
    All authority conferred or agreed to be conferred by this Notice of
Guaranteed Delivery shall not be affected by, and shall survive, the death or
incapacity of the undersigned, and every obligation of the undersigned under
this Notice of Guaranteed Delivery shall be binding on the heirs, executors,
administrators, trustees in bankruptcy, personal and legal representatives,
successors and assigns of the undersigned.
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
 
                                PLEASE COMPLETE
 
<TABLE>
<S>                                         <C>
Principal Amount of Restricted Notes        Name(s) of Registered Holder(s):
 
Tendered for Exchange: $
 
Restricted Note Certificate No.(s)
(if available):
 
If Restricted Notes will be tendered by book-entry transfer, provide the following
information:
 
DTC Account Number:
 
Date:
</TABLE>
 
                                PLEASE SIGN HERE
 
<TABLE>
<S>                                         <C>
X
 
  Signature(s) of Owner(s) or Authorized
                Signatory                                      Date
 
Area Code and Telephone Number:
</TABLE>
 
- --------------------------------------------------------------------------------
 
    This Notice of Guaranteed Delivery must be signed by the registered
Holder(s) of Restricted Notes exactly as its (their) name(s) appear on
certificates for Restricted Notes or on a security position listing as the owner
of Restricted Notes, or by person(s) authorized to become registered Holder(s)
by endorsements and documents transmitted with this Notice of Guaranteed
Delivery. If signature is by a trustee, executor, administrator, guardian,
attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must provide the following information.
- --------------------------------------------------------------------------------
 
                      PLEASE PRINT NAME(S) AND ADDRESS(ES)
 
  Name(s):
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
  Capacity:
 -------------------------------------------------------------------------------
 
  Address(es):
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
  ----------------------------------------------------------------------------
 
              THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED
 
                                       3
<PAGE>
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, a member firm of a registered national securities exchange
or of the National Association of Securities Dealers, Inc. or a commercial bank
or trust company having an office or a correspondent in the United States, or
otherwise an "eligible guarantor institution" within the meaning of Rule 17Ad-15
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
hereby (1) represents that each holder of Restricted Notes on whose behalf this
tender is being made "own(s)" the Restricted Notes covered hereby within the
meaning of Rule 13d-3 under the Exchange Act, (2) represents that such tender of
Restricted Notes complies with Rule 14e-4 of the Exchange Act and (3) guarantees
that, within three New York Stock Exchange trading days from the expiration date
of the Exchange Offer, a properly completed and duly executed Letter of
Transmittal (or a facsimile thereof), together with certificates representing
the Restricted Notes covered hereby in proper form for transfer (or confirmation
of the book-entry transfer of such Restricted Notes into the Exchange Agent's
account at DTC, pursuant to the procedure for book-entry transfer set forth in
the Prospectus) and required documents will be deposited by the undersigned with
the Exchange Agent.
 
    The undersigned acknowledges that it must deliver the Letter of Transmittal
and Restricted Notes tendered hereby to the Exchange Agent within the time
period set forth above and the failure to do so could result in financial loss
to the undersigned.
 
<TABLE>
<S>                                            <C>
                Name of Firm                               Authorized Signature
 
                   Address                                         Title
 
                  Zip Code                                (Please Type or Print)
 
Area Code and Telephone No.                    Dated:
</TABLE>
 
NOTE: DO NOT SEND CERTIFICATES FOR RESTRICTED NOTES WITH THIS FORM. CERTIFICATES
FOR RESTRICTED NOTES SHOULD ONLY BE SENT WITH YOUR LETTER OF TRANSMITTAL.
 
                                       4
<PAGE>
                         NOTICE OF GUARANTEED DELIVERY
                                      FOR
                             6.125% NOTES DUE 2008
                                       OF
                         TYCO INTERNATIONAL GROUP S.A.
 
    As set forth in the prospectus dated February   , 1999 (the "Prospectus") of
Tyco International Group S.A. (the "Company") and Tyco International Ltd.
("Tyco") and in the Letter of Transmittal (the "Letter of Transmittal"), this
form or a form substantially equivalent to this form must be used to accept the
Exchange Offer (as defined below) if the certificates for the outstanding 6.125%
Notes due 2008 (the "Restricted Notes") of the Company and all other documents
required by the Letter of Transmittal cannot be delivered to the Exchange Agent
by the Expiration Date of the Exchange Offer or compliance with book-entry
transfer procedures cannot be effected on a timely basis. Such form may be
delivered by hand or transmitted by facsimile transmission, telex or mail to the
Exchange Agent no later than the Expiration Date, and must include a signature
guarantee by an Eligible Institution as set forth below. Capitalized terms used
herein but not defined herein have the meanings ascribed thereto in the
Prospectus.
 
                 The Exchange Agent for the Exchange Offer is:
                              The Bank Of New York
 
<TABLE>
<CAPTION>
BY REGISTERED OR CERTIFIED MAIL   FACSIMILE TRANSMISSIONS:   BY HAND OR OVERNIGHT DELIVERY
<S>                               <C>                       <C>
 
      The Bank of New York         (Eligible Institutions         The Bank of New York
     101 Barclay Street, 7E                Only)                   101 Barclay Street
    New York, New York 10286           (212) 815-4699        CorporateTrustServices Window
     Attn: Denise Robinson         CONFIRM BY TELEPHONE:              Ground Level
                                       (212) 815-2719           New York, New York 10286
                                   FOR INFORMATION CALL:         Attn: Denise Robinson
                                       (212) 815-2791
</TABLE>
 
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OR TRANSMISSION TO A FACSIMILE
NUMBER OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE A VALID DELIVERY. THE
METHOD OF DELIVERY OF ALL DOCUMENTS, INCLUDING CERTIFICATES, IS AT THE RISK OF
THE HOLDER. IF DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT
REQUESTED, PROPERLY INSURED, IS RECOMMENDED. YOU SHOULD READ THE INSTRUCTIONS
ACCOMPANYING THE LETTER OF TRANSMITTAL CAREFULLY BEFORE YOU COMPLETE THIS NOTICE
OF GUARANTEED DELIVERY.
 
    This Notice of Guaranteed Delivery is not to be used to guarantee
signatures. If a signature on a Letter of Transmittal is required to be
guaranteed by an Eligible Institution under the instructions thereto, such
signatures must appear in the applicable space provided on the Letter of
Transmittal for Guarantee of Signature(s).
 
       THE EXCHANGE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M.,
  NEW YORK CITY TIME, ON MARCH   , 1999 UNLESS THE EXCHANGE OFFER IS EXTENDED.
<PAGE>
Ladies and Gentlemen:
 
    The undersigned acknowledges receipt of the Prospectus and the related
Letter of Transmittal which describes the Company's offer (the "Exchange Offer")
to exchange $1,000 in principal amount of its 6.125% Notes due 2008 (the
"Exchange Notes") for each $1,000 in principal amount of its 6.125% Notes due
2008 (the "Restricted Notes"). The undersigned hereby tenders to the Company the
aggregate principal amount of Restricted Notes set forth below on the terms and
conditions set forth in the Prospectus and the related Letter of Transmittal
pursuant to the guaranteed delivery procedure set forth in the "Exchange
Offer--Guaranteed Delivery Procedures" section in the Prospectus and the
accompanying Letter of Transmittal.
 
    The undersigned understands that no withdrawal of a tender of Restricted
Notes may be made on or after the Expiration Date. The undersigned understands
that for a withdrawal of a tender of Restricted Notes to be effective, a written
notice of withdrawal that complies with the requirements of the Exchange Offer
must be timely received by the Exchange Agent at one of its addresses or by
facsimile specified on the cover of this Notice of Guaranteed Delivery prior to
the Expiration Date.
 
    The undersigned understands that the exchange of Restricted Notes for
Exchange Notes pursuant to the Exchange Offer will be made only after timely
receipt by the Exchange Agent of (1) such Restricted Notes (or Book-Entry
Confirmation of the transfer of such Restricted Notes into the Exchange Agent's
account at The Depository Trust Company ("DTC")) and (2) if Restricted Notes are
to be physically delivered, a Letter of Transmittal (or facsimile thereof) with
respect to such Restricted Notes, properly completed and duly executed, with any
required signature guarantees, this Notice of Guaranteed Delivery and any other
documents required by the Letter of Transmittal or, in the case of book-entry
transfer, a properly transmitted Agent's Message. The term "Agent's Message"
means a message transmitted by DTC to, and received by, the Exchange Agent and
forming part of the confirmation of a book-entry transfer, which states that DTC
has received an express acknowledgment from a participant in DTC tendering the
Restricted Notes and that such participant has received the Letter of
Transmittal and agrees to be bound by the terms of the Letter of Transmittal and
the Company may enforce such agreement against such participant.
 
    All authority conferred or agreed to be conferred by this Notice of
Guaranteed Delivery shall not be affected by, and shall survive, the death or
incapacity of the undersigned, and every obligation of the undersigned under
this Notice of Guaranteed Delivery shall be binding on the heirs, executors,
administrators, trustees in bankruptcy, personal and legal representatives,
successors and assigns of the undersigned.
 
                                       2
<PAGE>
- --------------------------------------------------------------------------------
 
                                PLEASE COMPLETE
 
<TABLE>
<S>                                         <C>
Principal Amount of Restricted Notes        Name(s) of Registered Holder(s):
Tendered for Exchange: $
 
Restricted Note Certificate No.(s)
(if available):
 
If Restricted Notes will be tendered by book-entry transfer, provide the following
information:
 
DTC Account Number:
 
Date:
</TABLE>
 
                                PLEASE SIGN HERE
 
<TABLE>
<S>                                         <C>
X
 
  Signature(s) of Owner(s) or Authorized
                Signatory                                      Date
 
Area Code and Telephone Number:
</TABLE>
 
- --------------------------------------------------------------------------------
 
    This Notice of Guaranteed Delivery must be signed by the registered
Holder(s) of Restricted Notes exactly as its (their) name(s) appear on
certificates for Restricted Notes or on a security position listing as the owner
of Restricted Notes, or by person(s) authorized to become registered Holder(s)
by endorsements and documents transmitted with this Notice of Guaranteed
Delivery. If signature is by a trustee, executor, administrator, guardian,
attorney-in-fact, officer or other person acting in a fiduciary or
representative capacity, such person must provide the following information.
 
- --------------------------------------------------------------------------------
 
                      PLEASE PRINT NAME(S) AND ADDRESS(ES)
 
  Name(s):
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
  Capacity:
 -------------------------------------------------------------------------------
 
  Address(es):
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
 -------------------------------------------------------------------------------
 
  ----------------------------------------------------------------------------
 
              THE GUARANTEE ON THE REVERSE SIDE MUST BE COMPLETED
 
                                       3
<PAGE>
                                   GUARANTEE
                    (NOT TO BE USED FOR SIGNATURE GUARANTEE)
 
    The undersigned, a member firm of a registered national securities exchange
or of the National Association of Securities Dealers, Inc. or a commercial bank
or trust company having an office or a correspondent in the United States, or
otherwise an "eligible guarantor institution" within the meaning of Rule 17Ad-15
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
hereby (1) represents that each holder of Restricted Notes on whose behalf this
tender is being made "own(s)" the Restricted Notes covered hereby within the
meaning of Rule 13d-3 under the Exchange Act, (2) represents that such tender of
Restricted Notes complies with Rule 14e-4 of the Exchange Act and (3) guarantees
that, within three New York Stock Exchange trading days from the expiration date
of the Exchange Offer, a properly completed and duly executed Letter of
Transmittal (or a facsimile thereof), together with certificates representing
the Restricted Notes covered hereby in proper form for transfer (or confirmation
of the book-entry transfer of such Restricted Notes into the Exchange Agent's
account at DTC, pursuant to the procedure for book-entry transfer set forth in
the Prospectus) and required documents will be deposited by the undersigned with
the Exchange Agent.
 
    The undersigned acknowledges that it must deliver the Letter of Transmittal
and Restricted Notes tendered hereby to the Exchange Agent within the time
period set forth above and the failure to do so could result in financial loss
to the undersigned.
 
<TABLE>
<S>                                            <C>
                Name of Firm                               Authorized Signature
 
                   Address                                         Title
 
                  Zip Code                                (Please Type or Print)
 
Area Code and Telephone No.                    Dated:
</TABLE>
 
NOTE: DO NOT SEND CERTIFICATES FOR RESTRICTED NOTES WITH THIS FORM. CERTIFICATES
FOR RESTRICTED NOTES SHOULD ONLY BE SENT WITH YOUR LETTER OF TRANSMITTAL.
 
                                       4


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