ZOLL MEDICAL CORPORATION
S-3, 2000-01-18
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1

    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 18, 2000

                                           REGISTRATION STATEMENT NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                                    FORM S-3
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                            ------------------------

                            ZOLL MEDICAL CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

<TABLE>
<S>                                                   <C>
                    MASSACHUSETTS                                          04-2711626
            (STATE OR OTHER JURISDICTION                                (I.R.S. EMPLOYER
          OF INCORPORATION OR ORGANIZATION)                            IDENTIFICATION NO.)
</TABLE>

                                32 SECOND AVENUE
                              BURLINGTON, MA 01803
                                 (781) 229-0020
   (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------

                               RICHARD A. PACKER
                      CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                            ZOLL MEDICAL CORPORATION
                                32 SECOND AVENUE
                              BURLINGTON, MA 01803
                                 (781) 229-0020
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------

                                   COPIES TO:

<TABLE>
<S>                                                   <C>
               RAYMOND C. ZEMLIN, P.C.                                    JOHN W. WHITE
             GOODWIN, PROCTER & HOAR LLP                             CRAVATH, SWAINE & MOORE
                   EXCHANGE PLACE                                       825 EIGHTH AVENUE
          BOSTON, MASSACHUSETTS 02109-2881                             NEW YORK, NY 10013
                   (617) 570-1000                                        (212) 474-1000
</TABLE>

                            ------------------------

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
possible after the effective date of this Registration Statement.

    If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

    If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [ ]

    If this form is used to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please 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(c)
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 delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                            ------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
                                                              PROPOSED MAXIMUM        PROPOSED MAXIMUM
                                        AMOUNT TO BE           OFFERING PRICE            AGGREGATE               AMOUNT OF
TITLE OF SHARES BEING REGISTERED       REGISTERED(1)            PER SHARE(2)           OFFERING PRICE         REGISTRATION FEE
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                <C>                     <C>                     <C>                     <C>
Common Stock, par value $.02 per
  share(3).......................        1,610,000                $37.5625              $60,475,625               $15,966
- ---------------------------------------------------------------------------------------------------------------------------------
- ---------------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Includes 210,000 shares of common stock which the Underwriters have the
    option to purchase solely to cover over-allotments, if any.

(2) Estimated solely for purposes of determining the registration fee pursuant
    to Rule 457(c) under the Securities Act of 1933 based on the average high
    and low trading prices of the common stock, as reported on the Nasdaq
    National Market, on January 10, 2000.

(3) This Registration Statement also relates to the rights to purchase shares of
    Series A Junior Participating Cumulative Preferred Stock of the Registrant
    which are attached to all shares of Common Stock issued, pursuant to the
    terms of the Registrant's Shareholder Rights Agreement dated as of June 8,
    1998. Until the occurrence of certain prescribed events, the rights are not
    exercisable, are evidenced by the certificates for the Common Stock and will
    be transferred with and only with such Common Stock. Because no separate
    consideration is paid for the rights, the registration fee therefore is
    included in the fee for the Common Stock.
                            ------------------------

    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>   2

        THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED.
        WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED
        WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS
        PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS NOT
        SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER
        OR SALE IS NOT PERMITTED.

                 SUBJECT TO COMPLETION, DATED JANUARY 18, 2000

PROSPECTUS
                                1,400,000 SHARES

                            ZOLL MEDICAL CORPORATION
                                  COMMON STOCK

                              $         PER SHARE
                               ------------------

     We are selling 1,400,000 shares of our common stock. We have granted the
underwriters a 30-day option to purchase up to an additional 210,000 shares to
cover over-allotments, if any.

     Our common stock is quoted on the Nasdaq National Market under the symbol
"ZOLL". The last reported sale price of our common stock on the Nasdaq National
Market on January 13, 2000 was $38.75 per share.

                               ------------------

     INVESTING IN OUR COMMON STOCK INVOLVES CERTAIN RISKS. SEE "RISK FACTORS"
BEGINNING ON PAGE 6.

     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                               ------------------

<TABLE>
<CAPTION>
                                                              PER SHARE       TOTAL
                                                              ---------    -----------
<S>                                                           <C>          <C>
Public Offering Price                                          $           $
Underwriting Discount                                          $           $
Proceeds to Zoll (before expenses)                             $           $
</TABLE>

     The underwriters expect to deliver the shares to purchasers on or about
            , 2000.

                               ------------------

SALOMON SMITH BARNEY
                     U.S. BANCORP PIPER JAFFRAY
                                         ADAMS, HARKNESS & HILL, INC.

            , 2000
<PAGE>   3

     YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. WE
HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH DIFFERENT INFORMATION. WE ARE NOT
MAKING AN OFFER OF THESE SECURITIES IN ANY STATE WHERE THE OFFER IS NOT
PERMITTED. YOU SHOULD NOT ASSUME THAT THE INFORMATION PROVIDED BY THIS
PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE ON THE FRONT OF THIS
PROSPECTUS.

                            ------------------------
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Prospectus Summary..........................................     3
Risk Factors................................................     6
Information Regarding Forward-Looking Statements............    15
Use of Proceeds.............................................    17
Market Price of Common Stock................................    17
Dividend Policy.............................................    17
Capitalization..............................................    18
Dilution....................................................    18
Selected Financial Data.....................................    19
Management's Discussion and Analysis of Financial Condition
  and Results of Operations.................................    20
Business....................................................    23
Management..................................................    37
Principal Stockholders......................................    39
Relationships and Related Party Transactions................    40
Underwriting................................................    41
Legal Matters...............................................    43
Experts.....................................................    43
Where You Can Find More Information.........................    43
Supplementary Combined Financial Statements.................   F-1
</TABLE>

                                        2
<PAGE>   4

                               PROSPECTUS SUMMARY

     This summary highlights information contained elsewhere in this prospectus.
You should read this entire prospectus carefully, including the "Risk Factors"
section. In addition, we incorporate by reference important business and
financial information in this prospectus.

OUR COMPANY

     We design, manufacture and market an integrated line of proprietary,
noninvasive cardiac resuscitation devices, our external
defibrillators/pacemakers, as well as disposable electrodes and emergency
medical system software information management solutions. Our cardiac
resuscitation products are designed to improve survival rates from sudden
cardiac arrest, the leading cause of death in the United States. Cardiac arrest
claims over 250,000 victims each year in the United States alone. For victims of
cardiac arrest, time is the most critical element for survival. According to the
American Heart Association, more than 95% of cardiac arrest victims die, in many
cases because life saving defibrillators arrive on the scene too late, if at
all. We believe that the importance of immediate treatment, coupled with an
aging population, implies a long-term growth opportunity in this market.

     We estimate the annual worldwide market for external defibrillators was
$525 million in 1999. We divide the market for cardiac resuscitation equipment
into three principle markets: the hospital, pre-hospital and public access
defibrillation market. We currently sell our devices in the hospital and pre-
hospital markets and plan to enter the public access markets within the next 12
to 24 months. We believe we are the second largest company in the world in
external defibrillator sales. In 1999 our revenues increased 37%, making us the
fastest growing worldwide external defibrillator company. We are the only
external defibrillator device manufacturer whose customers include all of the
top 12 cardiac care hospitals, as ranked by the U.S. News and World Report in
July 1999.

     A major element of our business strategy is to capitalize on the success of
the M Series, our most recent line of defibrillators. In addition, we will
promote the use of our proprietary biphasic waveform in order to increase our
market share in both the domestic and international markets for cardiac
resuscitation products.

OUR M SERIES DEFIBRILLATORS

     In September 1998, we shipped the first M Series defibrillator equipped
with a conventional monophasic waveform. The M Series is a new line of
defibrillators for both the hospital and pre-hospital markets. To date, the M
Series is our best selling product and represented more than 60% of our capital
equipment device sales in fiscal 1999. We believe the clinical superiority of
our biphasic waveform combined with the product advantages listed below offer
compelling reasons for customers to choose our M Series platform. We believe our
M Series offers the following competitive advantages:

     - portability;

     - ease of use with simple controls; and

     - vivid screen display.

     In addition, the M Series is an expandable platform that allows customers
to add features to tailor the devices to their specific needs.

OUR PROPRIETARY BIPHASIC WAVEFORM

     We recently began shipping M Series defibrillators equipped with our
proprietary biphasic waveform. Our biphasic waveform has demonstrated higher
clinical efficacy than conventional monophasic waveforms.

     We have received clearance from the Food and Drug Administration, or the
FDA, to label our M Series biphasic defibrillator as clinically superior to the
monophasic waveform for particular uses, making us the only company to receive a
claim of superiority on its biphasic waveform. We therefore believe that

                                        3
<PAGE>   5

our proprietary biphasic waveform is superior to the biphasic waveform utilized
by any of our competitors. We believe the clinical superiority of our biphasic
waveform combined with product advantages offer compelling reasons for customers
to choose our products.

OUR MARKET OPPORTUNITIES

     While we plan to increase our share in both the domestic and international
markets primarily by promoting our M Series and biphasic waveform, we also seek
future growth opportunities. We intend to enter the public access defibrillation
market with a low-cost automated external defibrillator, or AED. This AED will
bring cardiac resuscitation capabilities to the large and relatively
unpenetrated public access defibrillation market. In addition, we plan to
integrate the pieces of our information management solution into a single system
to capitalize on the significant growth opportunities that we believe exist in
the emergency medical systems data management market.

     We were incorporated in Massachusetts in 1980. Our executive offices are
located at 32 Second Avenue in Burlington, Massachusetts 01803, and our
telephone number is (781) 229-0020.

THE OFFERING

Common stock offered....................     1,400,000 shares

Common stock to be outstanding after the
offering................................     8,243,809 shares

Use of proceeds.........................     To fund business development, such
                                             as research and development and
                                             sales and marketing, to fund future
                                             acquisitions, particularly in
                                             current and related lines of
                                             business, to provide working
                                             capital and for general corporate
                                             purposes.

     Unless we specifically state otherwise, the information in this prospectus
does not take into account the issuance of up to 210,000 shares of common stock
which the underwriters have the option to purchase solely to cover
over-allotments. If the underwriters exercise their over-allotment option in
full, 8,453,809 shares of common stock will be outstanding after the offering.

     The number of shares of common stock to be outstanding immediately after
the offering is based upon shares outstanding as of January 1, 2000 and does not
take into account 1,063,918 shares of common stock issuable upon exercise of
options outstanding at a weighted average exercise price of $13.84 per share and
115,075 shares reserved under our existing stock option plans.

                                        4
<PAGE>   6

                             SUMMARY FINANCIAL DATA

<TABLE>
<CAPTION>
                                                                 FISCAL YEARS ENDED
                                              --------------------------------------------------------
                                              SEPT. 30,   SEPT. 28,   SEPT. 27,   SEPT. 26,   OCT. 2,
                                                1995        1996       1997(1)      1998        1999
                                              ---------   ---------   ---------   ---------   --------
                                                       (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>         <C>         <C>         <C>         <C>
INCOME STATEMENT DATA:
Net sales...................................  $ 45,884    $ 55,700    $ 57,833    $ 57,520    $ 78,682
Cost of goods sold..........................    20,421      24,545      25,372      24,268      32,486
                                              --------    --------    --------    --------    --------
Gross profit................................    25,463      31,155      32,461      33,252      46,196
Expenses:
  Selling and marketing.....................    15,575      16,773      18,484      20,152      24,364
  General and administrative................     4,313       4,809       6,749       6,239       7,422
  Research and development..................     4,360       4,464       6,430       6,583       6,916
                                              --------    --------    --------    --------    --------
     Total expenses.........................    24,248      26,046      31,663      32,974      38,702
                                              --------    --------    --------    --------    --------
Income from operations......................     1,215       5,109         798         278       7,494
Net investment income (expense).............       243         278         355         413         (45)
                                              --------    --------    --------    --------    --------
Income before income taxes..................     1,458       5,387       1,153         691       7,449
Provision for income taxes..................       496       1,758         266          18       2,010
                                              --------    --------    --------    --------    --------
Net income..................................  $    962    $  3,629    $    887    $    673    $  5,439
                                              ========    ========    ========    ========    ========
Basic earnings per share....................  $   0.15    $   0.55    $   0.13    $   0.10    $   0.82
                                              ========    ========    ========    ========    ========
Weighted average common shares
  outstanding...............................     6,519       6,562       6,602       6,602       6,656
Diluted earnings per share..................  $   0.15    $   0.55    $   0.13    $   0.10    $   0.79
                                              ========    ========    ========    ========    ========
Weighted average common and equivalent
  shares outstanding........................     6,613       6,635       6,650       6,647       6,893
</TABLE>

<TABLE>
<S>                                                           <C>
Pro forma information(2):
Historical income before income taxes.......................  $ 7,449
  Pro forma incremental operating costs.....................      272
                                                              -------
  Pro forma income before income taxes......................    7,177
  Pro forma provision for income taxes......................    2,402
                                                              -------
  Pro forma net income......................................  $ 4,775
                                                              =======
  Pro forma diluted earnings per share......................  $  0.69
                                                              =======
</TABLE>

<TABLE>
<CAPTION>
                                                                   OCTOBER 2, 1999
                                                              -------------------------
                                                               ACTUAL    AS ADJUSTED(3)
                                                              --------   --------------
                                                                   (IN THOUSANDS)
<S>                                                           <C>        <C>
BALANCE SHEET DATA:
Working capital.............................................  $ 26,728     $  77,159
Total assets................................................    59,687       110,118
Total long-term debt, excluding current portion.............     2,069         2,069
Total stockholders' equity..................................    41,222        91,653
</TABLE>

- ---------------
(1) For the year ended September 27, 1997, excluding one-time charges totaling
    $2,300, net income would have been $2,405 and basic and diluted earnings per
    share would have been $0.36.

(2) Pro forma information reflects the effect of (i) incremental operating costs
    expected to be incurred by the Company as a result of the Pinpoint merger
    and (ii) the provision for corporate income taxes on the previously untaxed
    Subchapter S corporation earnings of Pinpoint. See Note B to the
    supplemental combined financial statements included elsewhere in this
    prospectus.

(3) The As Adjusted information gives effect to this offering and assumes no
    exercise of the underwriters' over-allotment option.

                                        5
<PAGE>   7

                                  RISK FACTORS

     An investment in our common stock involves significant risks. You should
carefully consider the following risks before you decide to buy our common
stock.

IF WE FAIL TO COMPETE SUCCESSFULLY IN THE FUTURE AGAINST EXISTING OR POTENTIAL
COMPETITORS, OUR OPERATING RESULTS MAY BE ADVERSELY AFFECTED

     Our principal global competitors with respect to our entire cardiac
resuscitation equipment product line are Physio-Control Corporation and Agilent
Technologies, Inc. Physio-Control is a subsidiary of Medtronic, Inc., a leading
medical technology company, and Agilent, which now includes Heartstream, Inc.,
was formerly part of Hewlett-Packard Company. Physio-Control has been the market
leader in the defibrillator industry for over twenty years and has a broader
line of product offerings and accessories than we do. As a result of
Physio-Control's dominant position in this industry, many potential customers
have relationships with Physio-Control that could make it difficult for us to
continue to penetrate our product markets. In addition, Physio-Control, its
parent and Agilent and other competitors each have significantly greater
resources than we do. Accordingly, Physio-Control, Agilent and other competitors
could substantially increase the resources they devote to the development and
marketing of products that are competitive with ours. Moreover, these and other
competitors may develop and successfully commercialize medical devices that
directly or indirectly accomplish what our products are designed to accomplish
in a superior and/or less expensive manner. For example, we expect our
competitors to develop and sell devices in the future that will compete directly
with our M Series product line and our biphasic waveform technology. As a
consequence, such competing medical devices may render our products obsolete.

     In addition to external defibrillation and external pacing with cardiac
resuscitation equipment, it is possible that other alternative therapeutic
approaches to the treatment of sudden cardiac arrest may be developed. These
alternative therapies or approaches, including pharmaceutical or other
alternatives, could prove to be superior to our products.

     Moreover, there is significant competition in the business of developing
and marketing software for data collection, billing and management in the
emergency medical services market. Our principal competitors in this business
include PAD Systems, Healthware Technologies, Inc., Tritech Software Systems,
Inc., Sweet Computer Services, Inc., RAM Software Systems, Inc., Intergraph
Corporation and AmbPac, Inc., some of which have greater financial, technical,
research and development and marketing resources than we do. In addition,
because the barriers to entry in this business are relatively low, additional
competitors may easily enter this market in the future. It is possible that
systems developed by competitors could be superior to our data management
system. Consequently, our ability to sell our data management systems could be
materially impacted and our financial results could be materially and adversely
affected.

OUR OPERATING RESULTS ARE LIKELY TO FLUCTUATE WHICH COULD CAUSE OUR STOCK PRICE
TO BE VOLATILE AND THE ANTICIPATION OF A VOLATILE STOCK PRICE CAN CAUSE GREATER
VOLATILITY

     Our quarterly and annual operating results have fluctuated and may continue
to fluctuate. Various factors have and may continue to affect our operating
results, including:

     - high demand for our products which can disrupt our normal factory
       utilization and cause shipments to occur in uneven patterns;

     - variations in product orders;

     - timing of new product introductions;

     - changes in distribution channels;

     - actions taken by our competitors such as the introduction of new products
       or the offering of sales incentives;

                                        6
<PAGE>   8

     - the ability of our sales force to effectively market our products;

     - supply interruptions from our single source vendors;

     - regulatory actions, including actions taken by the U.S. Food and Drug
       Administration; and

     - delays in obtaining domestic or foreign regulatory approvals.

     Based on these factors, period to period comparisons should not be relied
upon as indications of future performance. In addition, in anticipation of less
successful quarterly results, parties may take short positions in our stock. The
actions of parties shorting our stock might cause even more volatility in our
stock price. The volatility of our stock may cause the value of a stockholder's
investment to decline rapidly.

WE MAY BE REQUIRED TO IMPLEMENT A COSTLY PRODUCT RECALL

     In the event that any of our products proves to be defective, we can
voluntarily recall, or the U.S. Food and Drug Administration, the FDA, could
require us to redesign or implement a recall of, any of our products. We and our
competitors have voluntarily recalled products in the past, and based on this
experience, we believe that future recalls could result in significant costs to
us and significant adverse publicity which could harm our ability to market our
products in the future. Though it is not possible to quantify the economic
impact of a recall, it could have a material adverse effect on our business,
financial condition and results of operations.

WE CAN BE SUED FOR PRODUCING DEFECTIVE PRODUCTS AND WE MAY BE REQUIRED TO PAY
SIGNIFICANT AMOUNTS TO THOSE HARMED IF WE ARE FOUND LIABLE, AND OUR BUSINESS
COULD SUFFER FROM ADVERSE PUBLICITY

     The manufacture and sale of medical products such as ours entail
significant risk of product liability claims. Our quality control standards
comply with FDA requirements and we believe that the amount of product liability
insurance we maintain is adequate based on past product liability claims in our
industry. We cannot assure you, however, that the amount of such insurance will
be sufficient to satisfy claims made against us in the future or that we will be
able to maintain insurance in the future at satisfactory rates or in adequate
amounts. Product liability claims could result in significant costs or
litigation. In addition, a successful claim brought against us in excess of our
available insurance coverage or any claim that results in significant adverse
publicity against us could have a material adverse effect on our business,
financial condition and results of operations.

OUR DEPENDENCE ON SOLE AND SINGLE SOURCE SUPPLIERS EXPOSES US TO SUPPLY
INTERRUPTIONS THAT COULD RESULT IN PRODUCT DELIVERY DELAYS AND SUBSTANTIAL COSTS
TO REDESIGN OUR PRODUCTS

     Although we use many standard parts and components for our products, some
key components are purchased from sole or single source vendors for which
alternative sources are not currently readily available. For example, we
currently purchase proprietary components, including capacitors, screens, gate
arrays and integrated circuits, for which there are no direct substitutes. Our
inability to obtain sufficient quantities of these components may result in
future delays or reductions in product shipments which could cause a fluctuation
in our results of operations.

     These components could be replaced with alternatives from other suppliers,
which could involve a redesign of our products. Such redesign could involve
considerable time and expense. For example, in 1999, one of our vendors was
unable to provide sufficient quantities of screens that were used in our M
Series products. To keep up with the demand for our products, we sought
alternative screens from another supplier and redesigned our product
accordingly. Redesigning our products resulted in additional costs and delays in
the shipment of some of our products. Although we believe we have solved this
supply problem, we cannot assure you that we will not have similar supply
problems in the future.

                                        7
<PAGE>   9

OUR RELIANCE ON INDEPENDENT MANUFACTURERS CREATES SEVERAL RISKS THAT COULD
RESULT IN PRODUCT DELIVERY DELAYS, INCREASED COSTS AND OTHER ADVERSE EFFECTS ON
OUR BUSINESS

     We currently engage a small number of independent manufacturers to
manufacture several components for our products, including circuit boards,
molded plastic components, cables and high voltage assemblies. Our reliance on
these independent manufacturers involves a number of risks, including the
potential for inadequate capacity, unavailability of, or interruptions in access
to, process technologies, and reduced control over delivery schedules,
manufacturing yields and costs.

     If our manufacturers are unable or unwilling to continue manufacturing our
components in required volumes, we will have to transfer manufacturing to
acceptable alternative manufacturers whom we have identified, which could result
in significant interruptions of supply. Moreover, the manufacture of these
components is complex, and our reliance on the suppliers of these components
exposes us to potential production difficulties and quality variations, which
could negatively impact the cost and timely delivery of our products.
Accordingly, any significant interruption in the supply, or degradation in the
quality, of any component would have a material adverse effect on our business,
financial condition and results of operations.

FAILURE TO PRODUCE NEW PRODUCTS OR OBTAIN MARKET ACCEPTANCE FOR OUR NEW PRODUCTS
IN A TIMELY MANNER COULD HARM OUR BUSINESS

     Because substantially all of our revenue comes from the sale of cardiac
resuscitation devices and related products, our financial performance will
depend upon market acceptance of, and our ability to deliver and support, new
products such as upgrades to the M Series defibrillator, a product for the
public access market and an integrated product for the EMS data management
market. We cannot assure you that we will be able to produce viable products in
the time frames we currently estimate. Factors which could cause delay in these
schedules or even cancellation of our projects to produce and market these new
products include research and development delays, the actions of our competitors
producing competing products and the actions of other parties who may provide
alternative therapies or solutions which could reduce or eliminate the markets
for pending products.

     The degree of market acceptance of any of our products will depend on a
number of factors, including:

     - our ability to develop and introduce new products in the time frames we
       currently estimate;

     - our ability to successfully implement new product technologies;

     - the market's readiness to accept new products such as our M Series and
       data management products;

     - the standardization of an automated platform for data management systems;

     - having adequate financial and technical resources for future product
       development and promotion;

     - the efficacy of our products; and

     - the prices of our products compared to the prices of our competitors'
       products.

     If our new products do not achieve market acceptance, our financial
performance will be adversely affected.

WE MAY NOT BE ABLE TO OBTAIN APPROPRIATE REGULATORY APPROVALS FOR OUR NEW
PRODUCTS

     The manufacture and sale of our products are subject to regulation by
numerous governmental authorities, principally the FDA and corresponding state
and foreign agencies. The FDA administers the Federal Food, Drug and Cosmetic
Act, as amended, and the rules and regulations promulgated thereunder. Some of
our products have been classified by the FDA as Class II devices and others,
such as our automated external defibrillators, have been classified as Class III
devices. All of these devices must

                                        8
<PAGE>   10

secure either a 510(k) pre-market notification clearance or an approved
pre-market approval application before they can be introduced into the United
States market. The process of obtaining 510(k) clearance typically takes several
months and may involve the submission of limited clinical data supporting
assertions that the product is substantially equivalent to another medical
device on the market prior to 1976. The pre-market approval process typically
requires substantially more time than does 510(k) clearance and requires the
submission of significant quantities of clinical data and supporting
information. Delays in obtaining either 510(k), or if necessary, pre-market
approval clearance could have an adverse effect on the introduction of future
products. Moreover, approvals, if granted, may limit the uses for which a
product may be marketed, which could reduce or eliminate the commercial benefit
of manufacturing any such product.

     We are also subject to regulation in each of the foreign countries in which
we sell products. Many of the regulations applicable to our products in such
countries are similar to those of the FDA. However, the national health or
social security organizations of certain countries require our products to be
qualified before they can be marketed in those countries. We cannot assure you
that such clearances will be obtained.

IF WE FAIL TO COMPLY WITH APPLICABLE REGULATORY LAWS AND REGULATIONS, THE FDA
COULD EXERCISE ANY OF ITS REGULATORY POWERS THAT COULD HAVE A MATERIAL ADVERSE
EFFECT ON OUR BUSINESS

     Every company that manufactures or assembles medical devices is required to
register with the FDA and to adhere to certain good manufacturing practices
which regulate the manufacture of medical devices and prescribe record keeping
procedures and provide for the routine inspection of facilities for compliance
with such regulations. The FDA also has broad regulatory powers in the areas of
clinical testing, marketing and advertising of medical devices. To ensure that
manufacturers adhere to good manufacturing practices, medical device
manufacturers are routinely subject to periodic inspections by the FDA. If the
FDA believes that a company may not be operating in compliance with applicable
laws and regulations, it could take any of the following actions:

     - place the company under observation and reinspect the facilities;

     - issue a warning letter apprising of violative conduct;

     - detain or seize products;

     - mandate a recall;

     - enjoin future violations; and

     - assess civil and criminal penalties against the company, its officers or
       its employees.

     We, like most of our U.S. competitors, have received warning letters from
the FDA in the past, and may receive warning letters in the future. We have
always complied with the warning letters we have received. However, our failure
to comply with FDA regulations could result in sanctions being imposed on us,
including restrictions on the marketing or recall of our products. These
sanctions could have a material adverse effect on our business.

WE ARE DEPENDENT ON LICENSED AND PURCHASED TECHNOLOGY FOR UPGRADEABLE FEATURES
IN OUR PRODUCTS, AND WE MAY NOT BE ABLE TO RENEW THESE LICENSES OR PURCHASE
AGREEMENTS IN THE FUTURE

     We license and purchase technology from third parties for upgradeable
features in our products, including 12 SL analysis program and pulse oximetry
technologies. We anticipate that we will need to license and purchase additional
technology to remain competitive. We may not be able to renew our existing
licenses and purchase agreements or to license and purchase other technologies
on commercially reasonable terms or at all. If we are unable to renew our
existing licenses and purchase agreements or we are unable to license or
purchase new technologies, we may not be able to offer competitive products.

                                        9
<PAGE>   11

FUTURE CHANGES IN APPLICABLE LAWS AND REGULATIONS COULD HAVE AN ADVERSE EFFECT
ON OUR BUSINESS

     Although we are not aware of any pending changes in applicable laws and
regulations, we cannot assure you that federal, state or foreign governments
will not change existing laws or regulations or adopt new laws or regulations
that regulate our industry. Changes in or adoption of new laws or regulations
could result in the following consequences that would have an adverse effect on
our business:

     - regulatory clearance previously received for our products could be
       revoked;

     - costs of compliance could increase; or

     - we may be unable to comply with such laws and regulations so that we
       would be unable to sell our products.

CHANGES IN THE HEALTH CARE INDUSTRY MAY REQUIRE US TO DECREASE THE SELLING PRICE
FOR OUR PRODUCTS OR COULD RESULT IN A REDUCTION IN THE SIZE OF THE MARKET FOR
OUR PRODUCTS, EACH OF WHICH COULD HAVE A NEGATIVE IMPACT ON OUR FINANCIAL
PERFORMANCE

     Trends toward managed care, health care cost containment, and other changes
in government and private sector initiatives in the United States and other
countries in which we do business are placing increased emphasis on the delivery
of more cost-effective medical therapies which could adversely affect the sale
and/or the prices of our products. For example:

     - major third-party payors of hospital services, including Medicare,
       Medicaid and private health care insurers, have substantially revised
       their payment methodologies during the last few years which has resulted
       in stricter standards for reimbursement of hospital charges for certain
       medical procedures;

     - Medicare, Medicaid and private health care insurer cutbacks could create
       downward price pressure in the cardiac resuscitation pre-hospital market;

     - proposals were adopted recently that will change the reimbursement
       procedures for the capital expenditure portion of the cost of providing
       care to Medicare patients;

     - numerous legislative proposals have been considered that would result in
       major reforms in the U.S. health care system that could have an adverse
       effect on our business;

     - there has been a consolidation among health care facilities and
       purchasers of medical devices in the United States who prefer to limit
       the number of suppliers from whom they purchase medical products, and
       these entities may decide to stop purchasing our products or demand
       discounts on our prices;

     - there is economic pressure to contain health care costs in international
       markets;

     - there are proposed and existing laws and regulations in domestic and
       international markets regulating pricing and profitability of companies
       in the health care industry; and

     - there have been recent initiatives by third party payors to challenge the
       prices charged for medical products which could affect our ability to
       sell products on a competitive basis.

     Both the pressure to reduce prices for our products in response to these
trends and the decrease in the size of the market as a result of these trends
could adversely affect our levels of revenues and profitability of sales, which
could have a material adverse effect on our business.

UNCERTAIN CUSTOMER DECISION PROCESSES MAY RESULT IN LONG SALES CYCLES WHICH
COULD RESULT IN UNPREDICTABLE FLUCTUATIONS IN REVENUES AND DELAY THE REPLACEMENT
OF CARDIAC RESUSCITATION DEVICES

     Many of the customers in the pre-hospital market consist of municipal fire
and emergency medical systems departments. As a result, there are numerous
decision-makers and governmental procedures in the decision process. In
addition, decisions at hospitals concerning the purchase of new medical devices
are sometimes made on a department-by-department basis. Accordingly, we believe
the purchasing decisions

                                       10
<PAGE>   12

of many of our customers may be characterized by long decision processes, which
have resulted in and may continue to result in long sales cycles for our
products. For example, the sales cycles for cardiac resuscitation products
typically have been between six to nine months, although some sales efforts have
taken as long as two years.

OUR INTERNATIONAL SALES EXPOSE OUR BUSINESS TO A VARIETY OF RISKS THAT COULD
RESULT IN SIGNIFICANT FLUCTUATIONS IN OUR RESULTS OF OPERATIONS

     Approximately 20% of our sales in fiscal 1999 were made to foreign
purchasers, particularly in countries located in Europe and Asia, and we plan to
increase the sale of our products to foreign purchasers in the future. As a
result, a significant portion of our sales is and will continue to be subject to
the risks of international business, including:

     - fluctuations in foreign currencies;

     - trade disputes;

     - changes in regulatory requirements, tariffs and other barriers;

     - the possibility of quotas, duties, taxes or other changes or restrictions
       upon the importation or exportation of the products being implemented by
       the United States or these foreign countries;

     - timing and availability of import/export licenses;

     - political and economic instability;

     - difficulties in accounts receivable collections;

     - difficulties in managing laws;

     - increased tax exposure if our revenues in foreign countries are subject
       to taxation by more than one jurisdiction;

     - accepting customer purchase orders governed by foreign laws which may
       differ significantly from U.S. laws and limit our ability to enforce our
       rights under such agreements and to collect damages, if awarded; and

     - the general economies of these countries in which we transact business.

     As international sales become a larger portion of our total sales, these
risks could create significant fluctuations in our results of operations. In
addition, these risks could affect our ability to resell trade-in products to
domestic distributors, who in turn often resell the trade-in products in
international markets. Our inability to sell trade-in products might require us
to offer lower trade-in values, which might impact our ability to sell new
products to customers desiring to trade in older models and then purchase newer
products.

FLUCTUATIONS IN CURRENCY EXCHANGE RATES MAY ADVERSELY AFFECT OUR INTERNATIONAL
SALES

     Our revenue from international operations can be denominated in or
significantly influenced by the currency and general economic climate of the
country in which we make sales. A decrease in the value of such foreign
currencies relative to the U.S. dollar could result in downward price pressure
for our products or losses from currency exchange rate fluctuations. As we
continue to expand our international operations, downward price pressure and
exposure to gains and losses on foreign currency transactions may increase. We
may choose to limit such exposure by entering into forward-foreign exchange
contracts or engaging in similar hedging strategies. We cannot assure you that
any currency exchange strategy would be successful in avoiding losses due to
exchange rate fluctuations, or that the failure to manage currency risks
effectively would not have a material adverse effect on our business, financial
condition, cash flows, and results of operations.

                                       11
<PAGE>   13

WE MAY FAIL TO ADEQUATELY PROTECT OR ENFORCE OUR INTELLECTUAL PROPERTY RIGHTS OR
SECURE RIGHTS TO THIRD PARTY PATENTS, AND OUR COMPETITORS CAN USE SOME OF OUR
PREVIOUSLY PROPRIETARY TECHNOLOGY

     Our success will depend in part on our ability to obtain and maintain
patent protection for our products, methods, processes and other technologies,
to preserve our trade secrets and to operate without infringing the proprietary
rights of third parties. To date, we have been issued 21 U.S. patents for our
various inventions and technologies. Additional patent applications have been
filed with the U.S. Patent and Trademark Office and are currently pending. The
patents that have been granted to us are for a definitive period of time and
will expire. We have filed certain corresponding foreign patent applications and
intend to file additional foreign and U.S. patent applications as appropriate.
We cannot assure you as to:

     - the degree and range of protection any patents will afford against
       competitors with similar products;

     - if and when patents will be issued;

     - whether or not others will obtain patents claiming aspects similar to
       those covered by our patent applications;

     - whether or not competitors will use information contained in our expired
       patents, such as our U.S. pacing system patent which will expire in 2000;

     - whether or not others will design around our patents or obtain access to
       our know-how; or

     - the extent to which we will be successful in avoiding any patents granted
       to others.

     For example, we have patents and pending patent applications for our
proprietary biphasic technology. Our competitors could develop biphasic
technology that has comparable or superior clinical efficacy to our biphasic
technology if our patents do not adequately protect our technology, our
competitors are able to obtain patents claiming aspects similar to our biphasic
technology or our competitors can design around our patents.

     If certain patents issued to others are upheld or if certain patent
applications filed by others issue and are upheld, we may be:

     - required to obtain licenses or redesign our products or processes to
       avoid infringement;

     - prevented from practicing the subject matter claimed in those patents; or

     - required to pay damages.

     Litigation or administrative proceedings, including interference
proceedings before the U.S. Patent and Trademark Office, related to intellectual
property rights could be brought against us or be initiated by us. Any judgment
adverse to us in any litigation or other proceeding arising in connection with a
patent or patent application could materially and adversely affect our business,
financial condition and results of operations. In addition, the costs of any
such proceeding may be substantial whether or not we are successful.

     Our success is also dependent upon the skills, knowledge and experience,
none of which is patentable, of our scientific and technical personnel. To help
protect our rights, we require all employees, consultants and advisors to enter
into confidentiality agreements which prohibit the disclosure of confidential
information to anyone outside of our company and require disclosure and
assignment to us of their ideas, developments, discoveries and inventions. We
cannot assure you, however, that these agreements will provide adequate
protection for our trade secrets, know-how or other proprietary information in
the event of any unauthorized use or disclosure of the lawful development by
others of such information.

                                       12
<PAGE>   14

RELIANCE ON OVERSEAS VENDORS FOR SOME OF THE COMPONENTS FOR OUR PRODUCTS EXPOSES
US TO INTERNATIONAL BUSINESS RISKS WHICH COULD HAVE AN ADVERSE EFFECT ON OUR
BUSINESS

     Some of the components we use in our products are acquired from foreign
manufacturers worldwide, particularly countries located in Europe and Asia. As a
result, a significant portion of our purchases of components is subject to the
risks of international business. The failure to obtain these components as a
result of any of these risks can result in significant delivery delays of our
products which could have an adverse effect on our business.

WE RELY HEAVILY ON SEVERAL EMPLOYEES WHO MAY LEAVE, AND TIGHT LABOR MARKETS MAY
MAKE IT DIFFICULT TO RECRUIT EMPLOYEES

     Our future operating results will depend in part upon the contributions of
the persons who will serve in senior management positions and the continued
contributions of key technical personnel, some of whom would be difficult to
replace. In addition, our future success will depend in part upon our ability to
attract and retain highly qualified personnel, particularly product design
engineers. Increasingly tight labor markets could make it more difficult and/or
expensive to recruit and retain employees in a cost effective manner. There can
be no assurance that such key personal will remain in our employ or that we will
be successful in hiring qualified personnel. Any loss of key personnel or the
inability to hire or retain qualified personnel could have a material adverse
effect on our business, financial condition and results of operations.

WE MAY USE A PORTION OF THE PROCEEDS OF THIS OFFERING TO ACQUIRE OTHER
BUSINESSES, AND WE MAY HAVE DIFFICULTY INTEGRATING THESE BUSINESSES OR
GENERATING AN ACCEPTABLE RETURN FROM ACQUISITIONS

     We may attempt to acquire or make strategic investments in businesses and
other assets. Such acquisitions will involve risks, including:

     - the inability to achieve the strategic and operating goals of the
       acquisition;

     - the inability to raise the required capital to fund the acquisition;

     - difficulty in assimilating the acquired operations and personnel;

     - disruption of our ongoing business; and

     - inability to successfully incorporate acquired technology into our
       existing product lines and maintain uniform standards, controls,
       procedures, and policies.

     We may not successfully overcome problems encountered in connection with
potential acquisitions. In addition, an acquisition could materially impair our
operating results by causing us to incur debt or requiring us to amortize
acquisition expenses and acquired assets.

PROVISIONS IN OUR CHARTER DOCUMENTS, OUR SHAREHOLDER RIGHTS AGREEMENT AND STATE
LAW MAY MAKE IT HARDER FOR OTHERS TO OBTAIN CONTROL OF ZOLL EVEN THOUGH SOME
STOCKHOLDERS MIGHT CONSIDER SUCH A DEVELOPMENT TO BE FAVORABLE

     Our board of directors has the authority to issue up to 1,000,000 shares of
undesignated preferred stock and to determine the rights, preferences,
privileges and restrictions of such shares without further vote or action by our
stockholders. The rights of the holders of common stock will be subject to, and
may be adversely affected by, the rights of the holders of any preferred stock
that may be issued in the future. The issuance of preferred stock could have the
effect of making it more difficult for third parties to acquire a majority of
our outstanding voting stock.

     In addition, our restated articles of organization provide for staggered
terms for the members of the board of directors which could delay or impede the
removal of incumbent directors and could make a merger, tender offer or proxy
contest involving the Company more difficult. Our articles, restated by-laws and
applicable Massachusetts law also impose various procedural and other
requirements that could delay or make a merger, tender offer or proxy contest
involving us more difficult.

                                       13
<PAGE>   15

     In addition, we have implemented a so-called poison pill by adopting our
shareholders rights agreement. This poison pill significantly increases the
costs that would be incurred by an unwanted third party acquiror if such party
owns or announces its intent to commence a tender offer for more than 15% of our
outstanding common stock. The existence of this poison pill could delay, deter
or prevent a takeover of Zoll.

     All of these provisions could limit the price that investors might be
willing to pay in the future for shares of our common stock which could preclude
our shareholders from recognizing a premium over the prevailing market price of
our stock.

WE HAVE ONLY ONE MANUFACTURING FACILITY FOR EACH OF OUR MAJOR PRODUCTS AND ANY
DAMAGE OR INCAPACITATION OF EITHER OF THE FACILITIES COULD IMPEDE OUR ABILITY TO
PRODUCE THESE PRODUCTS

     We have only one manufacturing facility which produces defibrillators and
one separate manufacturing facility which produces electrodes. Damage to either
facility could render us unable to manufacture the relevant product or to reduce
the output of products at the damaged facility. This could materially and
adversely impact our business, financial condition and results of operations.

OUR CURRENT AND FUTURE INVESTMENTS MAY LOSE VALUE IN THE FUTURE

     We have made a $2.0 million investment in LifeCor, Inc., a development
stage company, and may in the future invest in the securities of other companies
and participate in joint venture agreements. This investment and future
investments are subject to the risks that the entities in which we invest will
become bankrupt or lose money. Investing in securities involves risks and no
assurance can be made as to the profitability of any investment. Our inability
to identify profitable investments could adversely affect our financial
condition and results of operations. Unless we hold a majority position in an
investment or joint venture, we will not be able to control all of the
activities of the companies in which we invest or the joint ventures in which we
are participating. Because of this, such entities may take actions against our
wishes and not in furtherance of, and even opposed to, our business plans and
objectives. These investments are also subject to the risk of impasse if no one
party exercises ultimate control over the business decisions.

INVESTORS IN THIS OFFERING WILL SUFFER IMMEDIATE AND SUBSTANTIAL DILUTION IN THE
NET TANGIBLE BOOK VALUE PER SHARE

     Investors will incur immediate and substantial dilution in the net tangible
book value per share of the common stock you purchase in this offering. To the
extent outstanding options to purchase common stock are exercised, there will be
further dilution.

                                       14
<PAGE>   16

                INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

     This prospectus contains forward-looking statements. The forward-looking
statements are principally contained in the sections "Prospectus Summary,"
"Business" and "Management's Discussion and Analysis of Financial Condition and
Results of Operations." These statements involve known and unknown risks,
uncertainties and other factors which may cause our actual results, performance
or achievements to be materially different from any future results, performances
or achievements expressed or implied by the forward-looking statements.
Forward-looking statements include, but are not limited to statements regarding:

     - market acceptance of new products;

     - competition in the industry;

     - ability to satisfy demand for our products;

     - the impact of pending or future litigation;

     - the impact of future product recalls;

     - changes in, or the failure or inability to comply with, governmental
       regulation;

     - the integration of the personnel, products and operations of Pinpoint
       Technologies, Inc., which we recently acquired;

     - exchange rate fluctuations;

     - the availability of debt and equity financing;

     - development of new competitive technologies;

     - availability of key components for our products;

     - availability of qualified personnel;

     - international, national, regional and local economic and political
       changes;

     - the value of our investments;

     - our production scheduling and related capacity levels;

     - general economic conditions; and

     - trends affecting the medical device industry, our financial condition or
       results of operations.

     In some cases, you can identify forward-looking statements by terms such as
"may," "will," "should," "could," "would," "expects," "plans," "anticipates,"
"believes," "estimates," "projects," "predicts," "potential" and similar
expressions intended to identify forward-looking statements. These statements
reflect our current views with respect to future events and are based on
assumptions and subject to risks and uncertainties. Given these uncertainties,
you should not place undue reliance on these forward-looking statements. We
discuss many of these risks in greater detail under the heading "Risk Factors."
Also, these forward-looking statements represent our estimates and assumptions
only as of the date of this prospectus. Some of the factors that might cause
future results to differ include, but are not limited to, the following:

     - competition may lead to worse than expected financial condition or
       results of operations;

     - unpredictable demand for new products;

     - pending or future litigation may negatively impact our financial
       condition or results of operations;

     - future recalls may negatively impact our financial condition or results
       of operations;

     - government regulation may negatively impact our financial condition or
       results of operations;

     - costs associated with integrating acquisitions may be larger than we
       anticipate;

                                       15
<PAGE>   17

     - exchange rate fluctuations may affect profitability of overseas sales;

     - manufacturing disruptions could negatively impact our financial condition
       or results of operations;

     - qualified personnel may not be available which could negatively impact
       our ability to grow our business;

     - the value of our investments may decline which could negatively impact
       our financial condition or results of operations; and

     - the production of commercially feasible products may take longer and cost
       more than expected.

     You should read this prospectus and the documents that we incorporate by
reference in this prospectus completely and with the understanding that our
actual future results may be materially different from what we expect. We may
not update these forward-looking statements, even though our situation may
change in the future. We qualify all of our forward-looking statements by these
cautionary statements.

                                       16
<PAGE>   18

                                USE OF PROCEEDS

     We estimate that the net proceeds we will receive from the sale of
1,400,000 shares of common stock will be approximately $50.4 million, or
approximately $58.1 million if the underwriters fully exercise their
over-allotment option, assuming an offering price of $38.75 per share and after
deducting the estimated underwriting discounts and offering expenses. We expect
to use the net proceeds of this offering as follows:

     - to fund business development, such as research and development and sales
       and marketing;

     - to fund future acquisitions, particularly in current and related lines of
       business;

     - to provide working capital; and

     - for general corporate purposes.

      We have not determined the amount of net proceeds to be used for each of
the specific purposes listed. Accordingly, we will have broad discretion to use
the proceeds as we see fit.

                          MARKET PRICE OF COMMON STOCK

     Our common stock is traded publicly on the Nasdaq National Market under the
symbol "ZOLL". We completed the initial public offering of our common stock on
July 16, 1992. The following table shows the range of high and low sale prices
per share of our common stock as reported by the Nasdaq National Market for the
periods indicated.

<TABLE>
<CAPTION>
                                                              COMMON STOCK PRICE(1)
                                                              ----------------------
                                                               HIGH            LOW
                                                              -------        -------
<S>                                                           <C>            <C>
Fiscal year ended September 26, 1998
First Quarter...............................................  $ 7.25         $ 5.16
  Second Quarter............................................    7.44           4.88
  Third Quarter.............................................    8.00           5.50
  Fourth Quarter............................................   10.00           7.13
Fiscal year ended October 2, 1999
  First Quarter.............................................   11.44           7.06
  Second Quarter............................................   12.75           8.50
  Third Quarter.............................................   12.88           9.00
  Fourth Quarter............................................   31.81          11.88
Fiscal year ended September 30, 2000
  First Quarter.............................................   41.38          22.63
  Second Quarter (through January 13, 2000).................   40.13          36.13
</TABLE>

- ---------------
(1) The prices reflect the high and low closing prices as reported by the Nasdaq
    National Market.

     On January 13, 2000, the last sale price of our common stock reported by
the Nasdaq National Market was $38.75 per share. As of January 13, 2000, there
were 120 holders of record of our common stock.

                                DIVIDEND POLICY

     We have not declared or paid cash dividends on our common stock in the past
and do not intend to pay dividends on our common stock in the foreseeable
future.

                                       17
<PAGE>   19

                                 CAPITALIZATION

     The following table shows our capitalization as of October 2, 1999 on an
actual basis and as adjusted to reflect the sale of 1,400,000 shares of common
stock in this offering, assuming an offering price of $38.75 per share and after
deducting the estimated underwriting discounts and offering expenses. This table
should be read in conjunction with the financial statements and related notes
incorporated in this prospectus by reference and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" appearing elsewhere
in this prospectus.

<TABLE>
<CAPTION>
                                                                 OCTOBER 2, 1999
                                                              ----------------------
                                                              ACTUAL     AS ADJUSTED
                                                              -------    -----------
                                                                  (IN THOUSANDS)
<S>                                                           <C>        <C>
Long-term debt..............................................  $ 2,069      $ 2,069
                                                              -------      -------
Stockholders' equity:
  Preferred stock, $0.01 par value; 1,000,000 shares
     authorized; none issued
     and outstanding........................................       --           --
  Common stock, $0.02 par value; 19,000,000 shares
     authorized; 6,771,929 issued and outstanding, and
     8,171,929 shares issued and outstanding as adjusted for
     this offering..........................................      136          164
  Additional paid-in capital................................   22,439       72,842
  Retained earnings.........................................   18,647       18,647
                                                              -------      -------
     Total stockholders' equity.............................   41,222       91,653
                                                              -------      -------
          Total capitalization..............................  $43,291      $93,722
                                                              =======      =======
</TABLE>

     The above data excludes 866,499 shares of common stock issuable upon
exercise of options outstanding as of October 2, 1999 at a weighted average
exercise price of $7.98 per share and 12,650 shares of common stock issuable
upon exercise of certain stock purchase rights at a nominal price.

                                    DILUTION

     Our net tangible book value as of October 2, 1999 was approximately $40.7
million, or $6.02 per share. Net tangible book value per share represents the
amount of our total tangible assets less total liabilities divided by the total
number of shares of common stock outstanding. After giving effect to the sale by
us of 1,400,000 shares of common stock offered by this prospectus at an assumed
offering price of $38.75 per share and after deducting estimated underwriting
discounts and offering expenses, our net tangible book value at October 2, 1999
would have been approximately $91.2 million, or $11.16 per share. This
represents an immediate increase in net tangible book value of $5.14 per share
to existing stockholders and an immediate dilution of $27.59 per share to new
investors in this offering, as illustrated by the following table:

<TABLE>
<S>                                                           <C>      <C>
Public offering price per share.............................           $38.75
       Net tangible book value per share before the
        offering............................................  $6.02
       Increase per share attributable to new investors.....   5.14
                                                              -----

     Net tangible book value per share after offering.......            11.16
                                                                       ------
     Net tangible book value dilution per share to new
      investors.............................................           $27.59
                                                                       ======
</TABLE>

                                       18
<PAGE>   20

                            SELECTED FINANCIAL DATA

     The following selected financial data should be read in conjunction with
the financial statements and related notes and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" appearing elsewhere
in this prospectus. The selected financial data below as of and for each of the
five most recent fiscal years have been derived from our audited supplemental
combined financial statements. These financial statements are supplemental to,
rather than in place of the historical financial statements. The supplemental
combined financial statements will become the historical financial statements
upon issuance of our interim financial statements for the quarter ended January
1, 2000.

<TABLE>
<CAPTION>
                                                               FISCAL YEARS ENDED
                                            ---------------------------------------------------------
                                            SEPT. 30,   SEPT. 28,   SEPT. 27,   SEPT. 26,    OCT. 2,
                                              1995        1996       1997(1)      1998         1999
                                            ---------   ---------   ---------   ---------    --------
                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                         <C>         <C>         <C>         <C>          <C>
STATEMENT OF OPERATIONS DATA:
Net sales.................................  $ 45,884    $ 55,700    $ 57,833    $ 57,520     $ 78,682
Cost of goods sold........................    20,421      24,545      25,372      24,268       32,486
                                            --------    --------    --------    --------     --------
Gross profit..............................    25,463      31,155      32,461      33,252       46,196
Expenses:
  Selling and marketing...................    15,575      16,773      18,484      20,152       24,364
  General and administrative..............     4,313       4,809       6,749       6,239        7,422
  Research and development................     4,360       4,464       6,430       6,583        6,916
                                            --------    --------    --------    --------     --------
     Total expenses.......................    24,248      26,046      31,663      32,974       38,702
                                            --------    --------    --------    --------     --------
Income from operations....................     1,215       5,109         798         278        7,494
Net investment income (expense)...........       243         278         355         413          (45)
                                            --------    --------    --------    --------     --------
Income before income taxes................     1,458       5,387       1,153         691        7,449
Provision for income taxes................       496       1,758         266          18        2,010
                                            --------    --------    --------    --------     --------
Net income................................  $    962    $  3,629    $    887    $    673     $  5,439
                                            --------    --------    --------    --------     --------
Basic earnings per share..................  $   0.15    $   0.55    $   0.13    $   0.10     $   0.82
                                            ========    ========    ========    ========     ========
Weighted average common shares
  outstanding.............................     6,519       6,562       6,602       6,602        6,656
Diluted earnings per share................  $   0.15    $   0.55    $   0.13    $   0.10     $   0.79
                                            ========    ========    ========    ========     ========
Weighted average common and equivalent
  shares outstanding......................     6,613       6,635       6,650       6,647        6,893
Pro forma information(2):
  Historical income before income taxes...                                                   $  7,449
  Pro forma incremental operating cost....                                                        272
                                                                                             --------
  Pro forma income before income taxes....                                                      7,177
  Pro forma provision for income taxes....                                                      2,402
                                                                                             --------
  Pro forma net income....................                                                   $  4,775
                                                                                             ========
  Pro forma diluted earnings per share....                                                   $   0.69
                                                                                             ========

BALANCE SHEET DATA:
Working capital...........................  $ 24,223    $ 25,303    $ 24,361    $ 21,678     $ 26,728
Total assets..............................    36,263      42,507      45,013      46,656       59,687
Total long-term debt, excluding current
  portion.................................       864         713         565         446        2,069
Total stockholders' equity................    29,596      33,614      34,463      34,787       41,222
</TABLE>

- ---------------
(1) For the year ended September 27, 1997, excluding one-time charges totaling
    $2,300, net income would have been $2,405 and basic and diluted earnings per
    share would have been $0.36.

(2) Pro forma information reflects the effect of (i) incremental operating costs
    expected to be incurred by the Company as a result of the Pinpoint merger
    and (ii) the provision for corporate income taxes on the previously untaxed
    Subchapter S corporation earnings of Pinpoint. See Note B to the
    supplemental combined financial statements.

                                       19
<PAGE>   21

          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                           AND RESULTS OF OPERATIONS

     You should read the following discussion and analysis in conjunction with
our financial statements and related notes incorporated in this prospectus by
reference.

OVERVIEW

     On October 15, 1999, we acquired Pinpoint Technologies, Inc. and Pinpoint
Property Management LLC (Pinpoint individually and collectively) in a business
combination accounted for as a pooling of interests. Pinpoint, which creates,
develops and manufactures advanced information technology software, exclusively
focused on the emergency medical services market, became our wholly owned
subsidiary through the exchange of approximately 433,000 shares of our common
stock for all of the outstanding stock of Pinpoint. The Selected Financial Data
appearing elsewhere in this prospectus are derived from the supplemental
combined financial statements and presented on the assumption that the companies
were combined for all periods presented, and financial statements of prior years
have been restated to give effect to the combination. These supplemental
combined financial statements are supplemental to, rather than in place of, the
historical financial statements. The supplemental combined financial statements
will become the historical financial statements upon issuance of our interim
financial statements for the quarter ended January 1, 2000.

RESULTS OF OPERATIONS

  1999 COMPARED TO 1998

     Net sales reached record levels, increasing 37% from the prior year to
$78.7 million, reflecting the rapid market acceptance of the M Series platform
introduced to the market during the fourth quarter of 1998. Sales growth also
reflected the reorganization and enlargement of the North American sales force
to allow for a market-focused structure. Dedicated selling teams are now focused
on each of North America's markets: hospital and pre-hospital.

     We experienced significant growth in all major geographies and segments of
its business. During 1999, North American sales increased 36% to $65 million.
Within North America, equipment sales to the hospital and pre-hospital markets
increased 55% and 28%, to $30.9 million and $19.1 million, respectively. Sales
in the international market increased 39% from the prior year.

     Gross margin increased approximately 1% over the prior year. We experienced
an improvement in costs reflecting the M Series introduction and higher margins
from information management products, primarily Pinpoint products.

     Selling and marketing costs increased 21% over the prior year, due to the
increase in size of the North American sales force. Additionally, we established
a direct sales force in Germany during the fourth quarter of 1999. Selling and
marketing costs as a percentage of net sales decreased from 35% to 31%,
reflecting revenues which increased more rapidly than these costs as a result of
the reorganization of the North American sales force.

     General and administrative expenses decreased as a percentage of sales,
from 11% to 9%, due to emphasis on expense controls and absorption of relatively
fixed expenses by higher sales.

     Research and development expenses decreased as a percentage of sales, from
11% to 9%. Total expenses increased slower than revenues, reflecting the
completion of development of the initial M Series platform and the related
transfer of available resources to the biphasic project and other initiatives.

     We incurred net investment expense in 1999, as compared to net investment
income in 1998, due to the decrease in average cash balances from 1998 to 1999
and increased interest expense.

     The income tax provision increased from $18,000 in 1998 to $2,010,000 in
1999. This increase results primarily from increased domestic profitability
partially offset by the benefits resulting from the utilization
                                       20
<PAGE>   22

of tax loss carryforwards from foreign operations. The operating results of
Pinpoint for all periods presented do not include any provision for income taxes
as the company operated as a Subchapter S corporation for income tax purposes.
In the future, the Company's consolidated income tax provision will include an
income tax provision for Pinpoint's taxable income.

  1998 COMPARED TO 1997

     Our net sales remained relatively flat at $57,520,000 for 1998. An increase
in sales of disposable electrodes and information systems management products,
particularly Pinpoint, was offset by a decrease in equipment sales. We believe
that the decrease in equipment sales in North America was primarily the result
of customers holding back on purchases while waiting for the release of the M
Series, which was not shipped until the end of the fourth quarter of 1998. In
addition, the decrease in sales in the international market was primarily a
result of depressed foreign markets. The M Series did not have any significant
impact on the sales to the international markets in 1998 as the roll out to
international distributors continued into 1999.

     Gross profit increased as a percentage of sales from 56% to 58%. The
increase is a result of a higher mix of disposable electrodes and information
systems management products, particularly Pinpoint, relative to the equipment
business.

     Selling and marketing expenses increased as a percentage of sales from 32%
to 35%. Selling and marketing expenses increased 9% from $18,484,000 to
$20,152,000. Of this increase, $1,419,000 was due to higher payroll related cost
and travel expenditures reflecting the reorganization of the North American
sales force. This mid-year reorganization increased the size of and split the
sales force to focus on two distinct markets: hospital and pre-hospital. The
increase in selling and marketing expenses was due also to an increase in
expenditures for promotion, advertising and other selling activities related to
the introduction of the M Series and higher international selling expenditures
offset by a decrease in product services and support.

     General and administrative expenses slightly decreased as a percentage of
sales from 12% to 11%. General and administrative expenses decreased 8% from
$6,749,000 to $6,239,000. This decrease was due primarily to the occurrence of a
one-time charge recognized in 1997 of $1,300,000 related to the estimated cost
of proceeding to trial in a class action shareholder lawsuit. This decrease was
partially offset by an increase in 1998 for payroll related costs and
professional services.

     Research and development expenses remained consistent as a percentage of
sales. Research and development expenses increased from $6,430,000 to
$6,583,000. In 1997, a charge of $1,000,000 was made to account for the value of
in-process research and development acquired in the purchase of assets from
Westech. Excluding this charge, research and development expenses increased by
21%, or $1,153. This increase was due primarily to an increase in prototype and
testing expenses for new technology and start-up costs for the M Series and an
increase in payroll related costs.

     Net investment income increased from the prior year due primarily to higher
average cash balances.

     At September 26, 1998, we had available tax loss carryforwards of
approximately $1.6 million, which were primarily attributable to the our foreign
operations and were not available to offset domestic taxable income.

LIQUIDITY AND CAPITAL RESOURCES

     Our cash and investments in 1999 decreased $3.7 million from the prior
year. While net income increased $4.7 million from the prior year, cash used for
operating activities for 1999 increased $0.5 million over the same period in
1998. The cash usage was due primarily to an increase in accounts receivable and
inventories, partially offset by an increase in accounts payable. The increase
in accounts receivable reflected both overall sales growth and significant
shipments made during the latter part of the fourth quarter of 1999. The
increase in inventory reflected the introduction of the M Series platform.

                                       21
<PAGE>   23

During this period of introduction, our mix of product shipments is shifting and
we carried a broader mix of product in inventory to meets our customers' needs.

     The amount of cash required to fund investing in 1999 activities remained
relatively consistent with the prior year at $4.0 million.

     The $0.9 million increase in cash provided by financing activities in 1999
primarily results from the cash provided from the exercise of stock options
during the year, partially offset by distributions to Pinpoint stockholders.

     We maintain a working capital line of credit with our bank. Borrowings
under this line bear interest at the bank's base rate (8.25% at October 2,
1999). The full amount of the line was available to us at October 2, 1999. On
November 5, 1999, we increased our line of credit to $12.0 million.

     We expect that the combination of existing funds, cash generated from
operations and our existing line of credit will be adequate to meet our
operational liquidity and capital requirements for the foreseeable future.

                                       22
<PAGE>   24

                                    BUSINESS

OVERVIEW

     We design, manufacture and market an integrated line of proprietary,
noninvasive cardiac resuscitation devices, our external
defibrillators/pacemakers, as well as disposable electrodes and Emergency
Medical System, or EMS, software data management solutions. Our cardiac
resuscitation products are designed to improve survival rates from sudden
cardiac arrest, which is the leading cause of death in the United States.
Cardiac arrest claims over 250,000 victims each year in the United States alone.
For victims of cardiac arrest, time is the most critical element for survival.
According to the American Heart Association, more than 95% of victims with
cardiac arrest die, in many cases because life saving defibrillators arrive on
the scene too late, if at all.

     The importance of immediate treatment creates an annual worldwide market
for external defibrillators. We estimate the annual worldwide market for
external defibrillators was $525 million in 1999. We currently sell our devices
in the hospital and pre-hospital markets and plan to enter the public access
markets in the next 12 to 24 months. We believe we are the second largest
company in the world in external defibrillator sales. In 1999, our revenues
increased 37%, making us the fastest growing worldwide external defibrillator
company.

     Our newest line of defibrillators is the M Series, which we began shipping
with the conventional monophasic waveform in September 1998. M Series
defibrillators are smaller and lighter than competitive products, making them
easier to use, carry and transport. We recently began shipping M Series
defibrillators equipped with our proprietary biphasic waveform that provides
improved defibrillation efficacy as compared to conventional monophasic
waveforms. We have received clearance from the U.S. Food and Drug
Administration, or FDA, to label our M Series biphasic defibrillator as being
clinically superior to the monophasic waveform for particular uses, making us
the only company to receive a claim of superiority on its biphasic waveform. We
believe the clinical superiority of our biphasic waveform combined with product
advantages including small size, low weight and relative ease of use offer
compelling reasons for customers to choose our products.

OUR BUSINESS STRATEGY

     The cardiac resuscitation market is a large and growing market driven by a
demonstrated and increasing clinical need. Our business strategy is to continue
to gain an increased share in both the domestic and international markets by
offering superior products through direct sales distribution. While we plan to
increase our share in markets that we currently serve, we also seek future
growth by entering into new markets with significant opportunities. We believe
that the following elements of our strategy may provide current and longer-term
growth to our business:

     - CONTINUE TO EXPAND SUCCESSFUL SALES OF M SERIES DEFIBRILLATORS.  A major
       element of our business strategy is to capitalize on the success of the M
       Series in order to increase our market share in the hospital and
       pre-hospital markets. To date, the M Series is our best selling
       defibrillator, representing more than 60% of our capital equipment device
       sales in the fourth quarter of fiscal 1999. We plan to increase our
       profits in this segment by doing the following:

       -- improving on the M Series with more optional features and new
          technologies, providing additional revenues for each M Series unit
          sold;

       -- expanding our presence in both the domestic and international markets
          by hiring additional sales people; and

       -- gaining economies of scale and decreasing our cost of production for
          the M Series by expanding sales of the M Series.

     - ESTABLISH A PRE-EMINENT CLINICAL POSITION IN BIPHASIC DEFIBRILLATION.  We
       plan to capitalize on the industry wide move to biphasic technology. We
       believe that this move will give customers a

                                       23
<PAGE>   25

       compelling reason to replace their monophasic defibrillators and thus
       increase the size of the external defibrillator market. We are currently
       the only company to have received clearance from the FDA to label our
       biphasic defibrillator as clinically superior to monophasic
       defibrillators for particular uses. We believe that the demonstrated
       clinical superiority of our proprietary biphasic waveform will offer a
       significant reason for customers to choose our biphasic product over the
       biphasic products of our competitors. We intend to capitalize on our
       clinically superior product to allow us to capture a larger percentage of
       the growing external defibrillator market.

     - ENTER THE PUBLIC ACCESS DEFIBRILLATOR MARKET WITH A WELL-DIFFERENTIATED
       PRODUCT.  We are developing a product for the large, and relatively
       unpenetrated public access defibrillation market also sometimes referred
       to as the AED market. This device will be relatively low cost and easy to
       operate. We believe we will be able to leverage our experience selling to
       EMS personnel in our efforts to sell our AED to police and fire
       departments. We also intend to sell our AED to other non-traditional
       providers of care.

     - SEEK ADDITIONAL GROWTH OPPORTUNITIES IN THE EMS INFORMATION MANAGEMENT
       MARKET.  We believe that the market for EMS information management
       solutions is significant and relatively unpenetrated. We are currently
       selling several products to this market. We are developing an integrated
       dispatch, clinical information, data collection, data transfer, billing
       and quality assurance software solution for sale to the EMS market. We
       intend to leverage our existing relationships with purchasing
       decision-makers in this market to sell our information management
       solutions. We believe our software solution will be differentiated by our
       ability to offer a complete data management solution which incorporates
       the clinical information collected by our defibrillators.

OVERVIEW OF SUDDEN CARDIAC DEATH AND RESUSCITATION THERAPIES

     Sudden cardiac death results from the unresuscitated sudden, abrupt loss or
disruption of heart function. This loss of heart function, also known as cardiac
arrest, is caused by the heart beating too rapidly and/or chaotically. The
American Heart Association, or AHA, estimates that sudden cardiac death claims
more than 250,000 lives each year in the United States alone, making it the
leading cause of death in the United States. According to the AHA, early
defibrillation is the single most critical factor in rescuing a victim of
cardiac arrest. Each minute of delay in returning the heart to its normal
pattern of beating decreases the chance of survival by 7% to 10%. As
demonstrated in the graph shown below, after 10 minutes, very few resuscitation
attempts are successful.

                                      SURVIVAL CURVE
     Shown here in the printed form of this prospectus is a graph of survival
rate vs. time to defibrillation. Time is displayed in minutes on the horizontal
axis, and the percent survival rate is displayed on the vertical axis. At 0
minutes, the survival rate is above 70%, decreasing so that at 5 minutes, the
survival rate is approximately 30%, and at 10 minutes the survival rate is less
than 20%. The survival rate continues to decrease toward zero after 15 minutes.

                                       24
<PAGE>   26

     The Human Heart.  The normal human heart has four chambers and expands and
contracts over 100,000 times each day. The two smaller, upper chambers are the
atria and the two larger, lower chambers are the ventricles. The walls of the
atria and ventricles are made up of cardiac muscle which contracts rhythmically
when stimulated by an electrical current. Normally, the heartbeat starts in the
right atrium when a specialized group of cells sends an electrical signal. This
signal spreads though the atria and then to the ventricles. As a result, the
atria contract a fraction of a second before the ventricles. This exact pattern
must be followed to ensure that the heart beats properly. This contraction and
relaxation of the four chambers pumps blood to the lungs and the rest of a body.

     Arrhythmias are abnormal rhythms of the heart caused by insufficient
circulation of oxygenated blood, drugs, electrical shock, mechanical injury,
disease or other causes. The three types of arrhythmias which our devices are
designed to treat are ventricular fibrillation, atrial fibrillation and
bradycardia. It is possible for a patient to experience more than one type of
arrhythmia during a cardiac arrest. In these situations, it is important to have
resuscitation equipment which has both defibrillation and pacing capabilities.

     Ventricular Fibrillation.  Ventricular fibrillation is a condition in which
disordered electrical activity causes the ventricles to contract in a rapid,
unsynchronized and uncoordinated fashion. When this occurs, an insufficient
amount of blood is pumped from the heart. Ventricular fibrillation is the most
common arrhythmia that causes cardiac arrest. The onset of ventricular
fibrillation often occurs without warning and causes the heart to stop abruptly.
This sudden stopping of the heart is known as cardiac arrest, and is the cause
of sudden cardiac death.

     The only accepted treatment of ventricular fibrillation is defibrillation,
in which a powerful electric shock is delivered to the heart to stop the
fibrillation and permit the return of coordinated cardiac contractions. In
emergency situations, external defibrillation has conventionally been
administered through hand-held paddles placed on the patient's chest. However,
external defibrillation can also be administered through disposable adhesive
electrodes, which we believe are safer and easier to use than paddles.

     Atrial Fibrillation.  The AHA estimates that close to 2 million Americans
suffer from atrial fibrillation. In atrial fibrillation, the atria contract in
an uncoordinated fashion instead of beating effectively due to an abnormal
spread of an electrical impulse through the tissue of the atria. This
inefficient contraction results in a smaller amount of blood entering the
ventricles, which in turn results in an insufficient level of circulation. Since
blood is not pumped completely out of the atria, the blood can pool and clot.
While not immediately life threatening, atrial fibrillation can lead to
significant health threats such as stroke. Over time, poorly functioning atria
can also cause the ventricles to work harder, wear out sooner and eventually
lead to cardiac arrest.

     Common forms of treatment for atrial fibrillation include cardioversion and
drug therapies. During cardioversion, a defibrillator delivers an electric shock
which is synchronized with a patient's heartbeat in order to return the atria to
a normal rhythm. Cardioversion is usually an elective therapy, scheduled and
performed in a controlled environment. All of our manual defibrillators include
cardioversion capability.

     Bradycardia.  Bradycardia is a condition in which the heart beats too
slowly. The principal therapies for the emergency treatment of bradycardia are
drugs and temporary cardiac pacing, either or both of which may be used to
stimulate effective cardiac contractions and restore circulation. Cardiac pacing
utilizes an electrical pulse to stimulate the patient's heartbeat. For the
emergency treatment of bradycardia, there are two primary techniques for
temporary pacing: invasive endocardial pacing, in which a wire is inserted
directly into the heart to provide the electrical stimulus; and noninvasive
temporary pacing, which uses gelled electrodes applied to the patient's chest to
conduct an electrical stimulus. Noninvasive temporary pacing is an option on
most of our defibrillators and is recommended as the first intervention for
bradycardia in the AHA's resuscitation protocols.

                                       25
<PAGE>   27

OUR CARDIAC RESUSCITATION PRODUCTS

  M SERIES DEFIBRILLATOR

     In September 1998, we shipped the first M Series defibrillator. The M
Series is a new line of defibrillators for both the hospital and pre-hospital
markets. For fiscal 1999, over 60% of our capital equipment device sales were M
Series products. The M Series has quickly become our best selling product to
date and has been recently selected as the standard device in such places as The
Mayo Clinic, Scripps Health System, The Johns Hopkins Hospitals and the White
House. We believe the clinical superiority of our biphasic waveform combined
with product advantages including portability, ease of use and the vivid screen
display offer compelling reasons for customers to choose our M Series device.
Our M Series is a standardized platform. As a result, we believe that this will
help maximize customer retention by reducing the need for operator retraining
and enhancing operator confidence.

     We believe our standard M Series products offer the following competitive
advantages:

     -  PORTABILITY.  The M Series Platform is the smallest, lightest full
        featured external defibrillator. It is approximately one-half the weight
        and less than one-half of the size of the other leading devices in this
        class. This allows M Series products to be easily used, carried and
        transported with patients.

     -  EASE OF USE WITH SIMPLE CONTROLS.  The M Series products enable users to
        efficiently configure each unit, allowing local operating preferences to
        be individually programmed into each unit. Additionally, M Series
        products are provided with multiple language labeling as well as
        multiple language voice prompts to meet both domestic and international
        needs.

     -  VIVID SCREEN DISPLAY.  One of the distinguishing features included in M
        Series products is its high contrast screen. Our screen incorporates the
        most technologically advanced display with a wider viewing angle than
        any LCD display.

     The following chart summarizes the features of the M Series as compared to
the primary competitive products.

                              PRODUCT COMPARISONS

<TABLE>
<CAPTION>
- -------------------------------------------------------------
                ZOLL       PHYSIO-CONTROL     AGILENT
              M SERIES          LP12       CODEMASTER XL
- -------------------------------------------------------------
<S>         <C>            <C>             <C>            <C>
SIZE          574 in(3)      1680 in(3)     1454 in(3)
- -------------------------------------------------------------
  WEIGHT       11 lbs.        22 lbs.         24 lbs.
- -------------------------------------------------------------
  SCREEN    High Contrast       LCD             CRT
- -------------------------------------------------------------
 FUNCTIONS    Multiple        Multiple          One
- -------------------------------------------------------------
  12 LEAD    Integrated      Integrated       Add-On
- -------------------------------------------------------------
</TABLE>

     The M Series is designed to be upgradable, allowing customers to add
features depending upon their individual needs. The M Series uses our unique
pacing technology, which has been clinically shown to provide superior capture
rates, lower mean capture thresholds, less muscle impact and better patient

                                       26
<PAGE>   28

tolerance. The M Series is also available with our patented biphasic waveform.
Some of the features which we currently offer include:

     - DIAGNOSTIC 12 LEAD ECG WITH INTERPRETIVE ALGORITHM.  In October, 1999, we
       received clearance from the FDA to include the GE Marquette Medical
       Systems 12SL analysis program, or 12 lead, in our M Series line of
       defibrillators. The 12 lead feature enables a user to see a diagnostic
       electrocardiogram, or ECG, tracing consisting of 12 leads, or views, of
       the heart's electrical activity. 12 lead is used to provide rapid and
       early identification of myocardial infarction, commonly called a heart
       attack, in the pre-hospital setting. We pay royalties on each 12SL
       analysis program we sell.

     - PULSE OXIMETRY.  Pulse oximeters determine the oxygen saturation levels
       in blood, allowing a rapid identification of potential problems in the
       cardiopulmonary system. Since pulse oximeters can help detect the onset
       of cardiovascular incidents, pulse oximetry is now widely used in both
       hospital and pre-hospital settings when monitoring patients' vital signs.
       While conventional pulse oximeters do not perform well in motion or in
       intense ambient light, we use Masimo Corporation's patented technology
       which is designed to overcome these technical problems. We have received
       510(k) clearance to incorporate this pulse oximetry technology into our M
       Series defibrillators. The new pulse oximetry technology adds a new
       monitoring parameter that is essential during the transport and
       monitoring of critical patients. We purchase circuit boards and sensors
       from Masimo Corporation. We have a non-exclusive license to use the
       patented technology incorporated in these parts which we then incorporate
       into our products.

     - CODE MARKERS WITH COMPLETE DATA MANAGEMENT.  Our new code marker system
       follows protocols established by the AHA and allows complete
       documentation of an event with our unique "one touch" data annotation
       feature. The record made of the event includes all information collected
       by the defibrillator and can be upgraded to include an optional voice
       recording. All of this data is stored on a removable data card.

     In the future, we intend to offer M Series defibrillators with additional
features, including, among others:

     - CAPNOGRAPHY.  Capnography, also known as etCO(2), is the measurement of
       the amount of carbon dioxide being exhaled, allowing for rapid
       identification of potential problems in the cardio-pulmonary system. We
       plan to purchase circuit boards and sensors from Novametrix Medical
       Systems Inc. to provide this feature. We currently expect to introduce an
       M Series with capnography during the next 3 to 6 months.

     - NONINVASIVE BLOOD PRESSURE MEASUREMENT.  We are in the process of
       developing a noninvasive blood pressure, also known as NiBP, measurement
       capability to be integrated into our M Series product. The technology
       encompassing this product will be licensed from a third party.

                                       27
<PAGE>   29

  BIPHASIC WAVEFORM

     External defibrillators deliver current over time to the heart, which
results in a defined waveform shape. A comparison of monophasic, typical
biphasic and our biphasic waveform is shown below. The waveform in general use
today is monophasic, meaning that current is delivered in a single pulse that
flows in one direction. A biphasic waveform, in contrast, delivers current that
first flows in a positive direction for a period of time and then reverses
direction so that it flows in a negative direction. Typical biphasic waveforms
such as those used by our competitors appear to achieve the same defibrillation
success rates as monophasic waveforms but at significantly lower current levels.
Since less current is used, potential injury to the heart and skin is reduced
with biphasic shocks compared to monophasic shocks. All of the major
manufacturers of external defibrillators are beginning to produce devices which
use biphasic waveforms.

                           [DEFIBRILLATION WAVEFORMS]

           Shown here in the printed form of this prospectus is a graphic
      representation of three types of defibrillation wave forms:
      monophasic, typical biphasic, and ZOLL biphasic. Current is plotted
      on the vertical axis and duration is plotted on the horizontal axis
      in each graph. This graphic depicts the wave forms described in the
      preceding paragraph.

     The biphasic waveforms are the first major advance in defibrillation
technology since the current monophasic waveform was adopted in the early
1960's. Although there have been feature enhancements that make new monophasic
defibrillators easier to use and maintain, they have not proven to make
defibrillators more clinically effective or safer and thus have not rendered the
older models obsolete. At present, users generally replace existing
defibrillators for mechanical and other reasons unrelated to any clinical
superiority of a new defibrillator. Based on our sales and marketing experience,
we estimate that users replace defibrillators after approximately seven to ten
years of service. In light of the demonstrated clinical superiority of biphasic
technology, we believe that the introduction of biphasic waveforms could
accelerate the replacement of the large installed base of monophasic
defibrillators. We believe this accelerated replacement will increase the size
of the market for our products.

  OUR BIPHASIC WAVEFORM

     Our two primary competitors offer biphasic waveforms using the same general
shape. We, however, have developed a uniquely shaped biphasic waveform with
higher efficacy than monophasic waveforms. We have received clearance from the
FDA to market this new technology. As shown in the comparison graphs above, our
new biphasic waveform reduces the heart's exposure to high peak current. In
addition, our biphasic waveform keeps the waveform shape and duration constant
over a wide range of patients who's differing physiologies impact the
transmittal of current. Our M Series with a biphasic waveform is the only device
cleared by the FDA for labeling as clinically superior to monophasic
defibrillators for conversion of ventricular fibrillation in high-impedance
patients, those patients who are difficult to defibrillate, and for
cardioversion of atrial fibrillation. We therefore believe that our proprietary
biphasic waveform is superior to the biphasic waveform utilized by any of our
competitors. Moreover, we are able to achieve the highest reported efficacy at
lower energy levels than utilized by our competitors. We believe that our new,
proprietary biphasic defibrillation waveform will offer compelling clinical
benefits that should give customers a reason to choose our biphasic product over
those of our competitors.

                                       28
<PAGE>   30

     We have sponsored two clinical trials that have demonstrated that our new
proprietary biphasic waveform provides improved efficacy compared to
conventional monophasic waveforms. In a randomized study for ventricular
fibrillation of 184 patients, our biphasic waveform converted 99% of patients on
the first shock compared to 93% of patients converted with the monophasic
waveform. This compares favorably with the results obtained by other parties in
similar trials.

                         [First Shock Efficacy for VF]

           Shown here in the printed form of this prospectus is a graphic
      representation of the first shock efficacy for ventricular
      fibrillation. Percent efficacy is plotted on the vertical axis. On
      the horizontal axis, 4 trials are plotted: an Agilent trial, a
      Physio-Control trial and two Zoll trials. One of the Zoll trials was
      conducted with high-impedence patients, all of the other trials did
      not separate the patients by impedence. In Zoll's all patients
      trial, Zoll's biphasic waveform converted 99% of the patients on the
      first shock, compared to 93% of patients converted with a monophasic
      waveform. In the trial with high impedence patients, Zoll's biphasic
      converted approximately 99% of patients versus the approximately 86%
      converted with the monophasic waveform. In Agilent's trial, each of
      Agilent's biphasic and monophasic waveforms converted approximately
      86% of the patient's on the first shock. In Physio-Control's trial,
      Physio-Control's biphasic waveform converted approximately 84% of
      patients versus the approximately 90% converted with the monophasic
      waveform.

     These studies also showed that our waveform required less than half the
current for converting ventricular and atrial fibrillation than the conventional
monophasic waveform. For example, the graph set forth below shows that less
current is needed to achieve 100% efficacy with our biphasic waveform.

  [Amount of Current Needed to Achieve 100% Efficacy Current Required for VF]

           Shown here in the printed form of this prospectus is a
      horizontal bar graph which depicts the amount of current, in
      amperes, required for each of a monophasic waveform and Zoll's
      biphasic waveform to reach 100% efficacy. The monophasic waveform
      requires nearly 50 amperes, while Zoll's biphasic waveform only
      requires approximately 15 amperes to achieve efficacy.

     A second randomized trial of 165 patients compared the efficacy of our
biphasic waveform to conventional monophasic technology for cardioversion of
atrial fibrillation. Our investigators reported a 68 percent first shock
efficacy of our waveform compared to just 21% for conventional monophasic
technology. Overall, 94% of the patients randomized to our waveform were
successfully cardioverted as compared to 79% of the patients treated with a
monophasic waveform. To our knowledge, no other competitor has published results
relating to their biphasic waveform in atrial fibrillation.

                                       29
<PAGE>   31

                        CARDIOVERSION EFFICACY FOR AF

            Shown here in the printed form of this prospectus is a
       vertical bar graph which depicts the comparative percent efficacy
       for cardioversion of atrial fibrillation of each of: a first shock
       using a monophasic waveform versus a first shock using ZOLL's
       biphasic waveform; and a cumulative shock using a monophasic
       waveform versus a cumulative shock using ZOLL's biphasic waveform.
       The bar graph depicts graphically the results described in the
       preceding paragraph.

     We have received six U.S. patents covering various aspects of our novel
biphasic waveform technology. One U.S. patent is still pending and several
corresponding foreign patents are also still pending.

  DISPOSABLE ELECTRODES

     We offer a variety of single-patient-use, proprietary disposable electrodes
for use with our resuscitation devices. Among our primary competitors, we are
the only company to engineer and manufacture our own electrodes. We have
continually innovated and upgraded our electrode product line, and in 1999 we
introduced pro padz Cardiology Specialty Multi-function Electrodes that utilize
a new conductive liquid gel to carry the energy from a conductive plate to the
patient. Our sales of electrodes in the North American market grew annually 8%
in 1998 as compared to 1997 and 17% in 1999 as compared to 1998. Our margins for
electrodes are generally higher than our margins for devices. We hope to sell
more disposable electrodes in the future as more customers recognize the
benefits of electrodes, which are safer for an operator of a defibrillator than
traditional paddles. Another factor that might lead to higher electrode sales is
the use of interpretive algorithms for automated defibrillation. The monitoring
required to assess the patient's condition can only be achieved with electrodes,
not the traditional defibrillation paddles. Accordingly, we believe that the
defibrillator industry is tending toward a greater relative use of electrodes.

  OTHER EXTERNAL DEFIBRILLATORS/PACEMAKERS

     We also manufacture and sell four other product lines of portable and
stand-alone defibrillators with advisory capability, semi-automatic and manual
operation as well as ancillary accessories and chargers.

MARKET OVERVIEW

     We divide the market for cardiac resuscitation equipment into three
principal markets: the hospital, pre-hospital and public access defibrillation
markets. The hospital market consists of doctors, nurses and other medical
personnel who use defibrillators in a hospital setting. The pre-hospital market
consists of care providers such as paramedics, ambulance operators, emergency
medical technicians, medically-trained firefighters and other "first response"
emergency medical personnel. The public access defibrillation market includes
non-traditional providers such as police, non-medically trained firefighters,
security officers, and other non-medically trained first responders. We estimate
the current size of the worldwide market for external defibrillators was
approximately $525 million in 1999.

                                       30
<PAGE>   32

  OUR CURRENT MARKET

     U.S. Hospital Market.  The U.S. hospital market consists of approximately
6,000 acute care community hospitals and 1,000 additional hospitals. Presently,
we are the only company whose defibrillators are used at each of the top 12
cardiac hospitals in the United States as listed by U.S. News and World Report
in July 1999.

     Hospitals have traditionally been the largest users of cardiac
resuscitation equipment, both for patients admitted for cardiac arrest and for
patients at risk of cardiac arrest undergoing other treatments. Many hospital
procedures such as surgery, cardiac catheterization, stress testing and general
anesthesia may induce arrhythmias or cardiac arrest, and hospitals frequently
use cardiac resuscitation devices on a standby basis in connection with these
procedures. Since immediate treatment is the critical factor for successful
cardiac resuscitation, hospitals typically place resuscitation devices
throughout their facilities, including in the cardiac and critical care units,
emergency rooms, operating rooms, electrophysiology laboratories and,
increasingly, in general wards. Hospitals also use portable devices during
in-hospital transportation of cardiac patients.

     We believe that the M Series has allowed us to significantly increase our
market share in the U.S. hospital market. Our revenues in the capital equipment
device market in 1999 increased at a rate of 52% compared to the market's growth
which we estimate to be between 3% and 5%. We hope to capitalize on the success
of our M Series defibrillators to further expand our share of the U.S. hospital
market.

     U.S. Pre-Hospital Market.  Most sudden cardiac arrests and heart attacks
occur outside of the hospital. Due to the importance of immediate treatment,
there is a substantial market for portable cardiac resuscitation equipment
designed for use by various emergency responders. The most highly trained
segment of the pre-hospital market is comprised of paramedics, who are all
authorized and trained to use defibrillators to treat cardiac arrest. In
addition, paramedics are becoming increasingly aware of pacing as a standard of
care for the treatment of bradycardia. We believe that as noninvasive temporary
pacing becomes more widely accepted in the hospital market, the use of
combination pacemakers/defibrillators will become more widespread in the
pre-hospital setting as well. Paramedics are also able to use more advanced
diagnostics, such as diagnostic 12 lead. Emergency medical technicians, who are
authorized to use automated external defibrillators, comprise a significant
portion of the potential pre-hospital market as well.

     Presently, approximately one-half of the estimated 35,000 ambulances in the
United States are equipped with defibrillators. We believe that this number will
grow, and that ambulances and other first response emergency vehicles will
represent an increasingly important market for cardiac resuscitation equipment
as the medical community places increased priority on providing such equipment
and the necessary training to all first responders. Additionally, we believe
that growth of our sales in the pre-hospital market has been constrained in the
recent past due to the absence of 12 lead technology in our defibrillators. With
our recent introduction of diagnostic 12 lead in the M Series, we intend to
increase our sales in the pre-hospital market and take greater market share
within the paramedic segment of the pre-hospital market.

     International Market.  The international market for defibrillators is less
developed than the market in the United States. In the international market,
unlike the United States market, the administration of pacing and defibrillation
in hospitals is generally viewed as a skill reserved for physicians. Few other
staff members are trained or encouraged to administer such treatment. The
international market for defibrillators for use outside of hospitals varies
considerably from country to country and is somewhat less developed than in
North America.

     We believe that the international market for defibrillators will grow for a
number of reasons.

     - The international hospital market for defibrillators is expected to grow
       as more hospitals are built and existing hospitals modernize and update
       their approaches to cardiac and emergency care.

                                       31
<PAGE>   33

     - Emerging standards of care and the acceptance of automated equipment
       could result in increased use of cardiac resuscitation equipment by a
       broader range of health care personnel in the international market.

     - The European Resuscitation Council, British Heart Foundation and
       virtually all cardiac oriented organizations in Europe as well as the
       Australian Resuscitation Council have strongly supported initiatives to
       expand the availability of defibrillators as a major public health
       initiative.

     - External pacing is used much less frequently in Europe and other parts of
       the world than it is in the United States, but many countries are
       beginning to implement cardiac life support protocols which incorporate
       external pacing as a standard component. Because most international
       defibrillators do not presently feature external pacing, the move to
       defibrillators which do feature external pacing could drive the
       international demand for defibrillators generally.

     We believe that we are positioned to take advantage of the growth in the
international market for defibrillators, based on the recent success of the M
Series, our superior biphasic technology, and the multiple language and other
capabilities of the M Series.

     We believe that there are significant opportunities to increase sales in
the international market through the use of direct sales. Historically, we have
used distributors instead of a direct sales force to sell our products
internationally. We believe using a direct sales force could increase our
revenues and market share in many countries. For example, we doubled our sales
in the United Kingdom in 1999, which we believe was due at least in part to the
efforts of our direct sales force established four years ago. In addition,
Germany, second only to the United States in market size, may be a strong market
for future growth. We are establishing a direct sales force in Germany and
expect to expand this sales force in the coming year. In addition, we are
beginning to fulfill our largest sales contract ever, a multi-year agreement
with the German Army to supply up to 1,500 defibrillators. We intend to further
expand our direct selling efforts in the coming years.

OUR MARKET OPPORTUNITIES

  PUBLIC ACCESS DEFIBRILLATION USING AEDs

     Public access defibrillation, or PAD, involves providing low cost automated
external defibrillators, or AEDs, to persons outside a hospital setting who are
not medically trained. Although we presently offer AEDs in the hospital and
pre-hospital markets, we are seeking to develop a low cost AED specifically
targeted to the needs of the PAD market. Traditionally, defibrillators have only
been used by personnel in hospitals and trained emergency medical service
personnel in the pre-hospital market. As mentioned above, time from onset of
cardiac arrest to defibrillation is the most important factor in successfully
treating cardiac arrest. Victims are likely to die if they are not defibrillated
within four to eight minutes of the onset of cardiac arrest. This need for
immediate treatment of cardiac arrest suggests that if more automated
defibrillators can be deployed outside of the hospital setting, the likelihood
of defibrillating a victim in the critical time frame will increase. Potential
customers for such devices in this broad market include police and fire
departments, office buildings and any other location where a large number of
people congregate. Ultimately, AEDs could be marketed to private homes, where
approximately 70% of cardiac arrests occur. In addition, we expect that demand
for AEDs could increase as public awareness of the time constraints inherent in
treating cardiac arrest grows and as more AEDs are introduced into highly
visible, public places.

     Some of our competitors offer cardiac resuscitation equipment in the PAD
market. We have not yet entered this market, because of the high selling costs
inherent to such a fragmented market. We do not believe the current AED
manufacturers have generated profitable operations from the PAD market in the
past. We believe, however, that this market has now expanded to the point where
AEDs can be profitably sold. More distributors are requesting and selling AEDs.
In addition, the recent passage of federal good samaritan legislation increases
the likelihood that non-medically trained personnel will be providing care to
victims of cardiac arrest. Good samaritan legislation generally protects persons
who render emergency

                                       32
<PAGE>   34

assistance to others from liability for negligence in connection with their
rendering of assistance. At least one state, Massachusetts, has amended its good
samaritan law to specifically cover the use of AEDs by the general public. In
addition, the AHA has begun to actively advocate PAD as a critical link in the
"Chain of Survival," which refers to the four crucial links in the treatment of
cardiac arrest. The AHA and virtually all corresponding international
organizations have established programs to try to bring early defibrillation to
every community. Early defibrillation is now included in AHA CPR training for
all healthcare personnel and some lay persons. We believe that these
developments, together with the introduction of AEDs in highly visible places,
will lead to a larger market for AEDs.

     Because we expect the PAD market to continue to mature, we intend to
produce and sell low cost AEDs in this market. We estimate that in calendar year
2000 the market for low cost AEDs will exceed $75 million. We expect to
introduce this new device within approximately 12 to 24 months. The device will
monitor the patient's ECG and automatically prompt the operator throughout the
defibrillation process. We intend to use a direct sales force to sell our AEDs
wherever it proves cost effective to do so, and will sell through alternate
distribution, such as distributors or manufacturer's representatives, in those
markets that are too small to support a direct sales force. In addition, we
expect that this market can be serviced by other alternative distribution
methods, such as e-commerce, that can supplement and reduce our need for an
expensive sales force. We also intend to use our experience of selling to
emergency medical service personnel in our future efforts to sell AEDs to police
and fire departments.

  EMS DATA MANAGEMENT SOLUTIONS

     We are developing a product called RescueNet(TM) to address what we
consider to be a growing need in the EMS market for an integrated information
management system. RescueNet(TM), which will combine existing technologies
developed by two of our subsidiaries with data collected from our cardiac
resuscitation devices, will allow our customers to purchase a single information
management system that integrates dispatch, resuscitation information, data
collection, data transfer, billing and quality assurance functions. Today, most
EMS data is entered by hand on clipboards and then distributed or reentered
manually into databases or other required formats to meet regulatory and
insurance reporting requirements. The timeliness, accuracy and efficiency of
this process is a key factor in the receipt of payments from third party payors.
Nevertheless, a significant amount of revenue is lost due to data-entry errors,
misplaced paperwork or data, and additional time is lost duplicating data
entries. As a result, we believe that the market for electronic field data
collection is significant and relatively unpenetrated. Of the estimated 35,000
ambulances in the United States today, we estimate that less than 5,000 of them
have any type of computer in place for the routine entry of data. Based upon our
experience, market interest in electronic field data collection is very high,
because EMS organizations are increasingly pressured to become more efficient.

     Using RescueNet(TM), caller information collected by the dispatcher would
first be organized and compared to existing databases in the system. Almost
immediately, useful information on the patient such as the patient's previous
medical history, the closest ambulance to the patient's address, the patients's
insurance numbers from previous service, and the patient's personal physician
would be provided to the ambulance or EMS system through the use of wireless
communications and radio links that already exist in most EMS systems. Data
collected by EMS personnel on the road, including simple data such as arrival
time at a scene or transport time to the hospital, as well as clinical data
derived from our defibrillators such as the number of shocks given, when those
shocks were given and at what energy levels, could be immediately shared via
wireless connection with the hospital to which the patient is being brought.
Information regarding services provided to the patient could be stored
electronically for billing and record-keeping purposes. Such seamless
information sharing would allow for better integration of information with the
dispatcher and with the hospital to which the patient is being transported,
while eliminating duplicative information collection.

     Ease of use and the need for efficiency in the use of information in
billing, case review, training and operations analysis are the fundamental
factors that we believe could drive the market for an integrated information
management system in the pre-hospital market. Although we plan to sell
RescueNet(TM) through
                                       33
<PAGE>   35

a dedicated sales force, we intend to utilize our existing relationships with
purchasing decision-makers in the EMS market who have purchased our
defibrillators in the past and to obtain sales efficiencies and synergies
through cross-selling.

     Our competition in dispatch, billing and mobile computing solutions
consists of mostly smaller software companies. We believe we have a competitive
advantage over other software companies due to our familiarity with the
information collected and stored by our defibrillators. Our ability to analyze,
store and retrieve this clinically important data could make our electronic
field data collection products more attractive.

     We expect that the EMS data management business will be a significant part
of our long-term growth strategy. We believe that this market could expand
rapidly and that we are particularly well positioned to become a significant
competitor in this business.

COMPETITION

     Our principal competitors in the United States are Physio-Control
Corporation and Agilent Technologies, Inc. Physio-Control is a subsidiary of
Medtronic, Inc., a leading medical technology company, and Agilent, which now
includes Heartstream, Inc., was formerly part of Hewlett-Packard Company. Both
Physio-Control and Agilent compete across our entire defibrillator product line.
We also compete with Medical Research Labs, Inc. and SurVivaLink, Inc. in
specific geographic areas and markets. In the international market we compete
with both Physio-Control and Agilent, as well as approximately 12 other
companies depending upon the country. Physio-Control is generally the market
leader in the industry.

     We believe that the principal competitive factors in the hospital market
for cardiac resuscitation equipment are clinical efficacy, reliability,
portability, ease of use and standardization. In the pre-hospital market, in
addition to the foregoing considerations, durability, a reliable battery system,
and availability of 12 lead ECG capability are significant competitive factors.
We believe that ours products compete favorably with respect to each of these
factors. Noninvasive temporary pacemakers and external defibrillators, such as
those we sell, are used in emergency situations and, accordingly, do not compete
with permanent, implantable pacemakers or defibrillators that are used to treat
chronic arrhythmias. In fact, the products are complementary, because emergency
cardiac resuscitation is often required during the implantation of a permanent
device.

     The business of developing and marketing software for data collection,
billing and management in the EMS market is competitive. Competitors in this
business include PAD Systems, Healthware Technologies, Inc., Tritech Software
Systems, Sweet Computer Services, Inc., RAM Software Systems, Inc., Intergraph
Corporation and AmbPac, Inc. None of these competitors currently have a product
that provides an integrated solution comparable to the RescueNet(TM) product
currently in development.

RESEARCH AND DEVELOPMENT

     Our research and development strategy is to improve and expand our product
line through the application of our proprietary technology to both devices and
electrodes. We pursue a multi-disciplinary approach to product design. We are
currently focusing our research and development program in mechanical, software
and electronic engineering, including both digital, (microprocessor) and analog
(high voltage) design. We hope to develop an inexpensive, easy to operate AED
for the PAD market. We are also seeking to expand the M Series features and
parameters and to develop further efficiencies in our M Series production,
leading to lower costs. In addition, we are continuing our work on the
development of the RescueNet(TM) product.

MANUFACTURING

     Our facilities are located in Burlington, Massachusetts and Pawtucket,
Rhode Island. Our executive headquarters are located at the Burlington facility,
where we also conduct our device manufacturing

                                       34
<PAGE>   36

operations and all of our research and development other than electrode and EMS
data management research and development. We generally assemble our devices from
components produced to our specifications by our suppliers. We own a 33,000
square foot building in Rhode Island, where we manufacture our electrode
products and conduct related research and development. We own a 17,500 square
foot building in Boulder, Colorado where our data management software business
offices are located. We lease approximately 90,000 square feet of office and
assembly space in Burlington under a lease expiring in August 2003, and 2,685
square feet of office space in Vancouver, British Columbia expiring in 2002. We
also have administrative offices in Manchester, England and Cologne, Germany.

PATENTS AND PROPRIETARY INFORMATION

     Six United States patents have now been issued covering various aspects of
our unique biphasic defibrillation waveform technology. One United States patent
relating to this technology is still pending as are several corresponding
foreign patents.

     During fiscal 1999, we filed several United States and foreign patent
applications covering novel technology related to our pacing and defibrillation
electrodes. These pending patents supplement other electrode patents issued or
pending in the United States, Europe and Japan.

     A number of United States patents covering technologies incorporated into
our other products have been issued. Foreign patents related to some of these
technologies are pending.

EMPLOYEES

     As of October 2, 1999, we employed 423 people on a full-time basis, 388 in
the U.S. and 35 internationally. We also employed six part-time employees. None
of our employees are subject to collective bargaining agreements. We believe
that our relations with our employees are excellent.

MARKETING AND SALES

     We use a direct sales force in the United States. In 1998, we split our
sales force into dedicated groups, focused on the hospital and pre-hospital
markets. Our total sales force was increased by 20% in both 1998 and 1999. We
sell our RescueNet(TM) product through a separate dedicated sales force. In the
United States, we currently have 48 sales representatives calling on hospitals,
33 calling on pre-hospital accounts and six selling our data management
products. We have four sales representatives in Canada, five in the United
Kingdom and two in Germany. We are in the process of hiring three additional
sales representatives for the German market.

GOVERNMENT REGULATION

     The manufacture and sale of our products are subject to extensive
regulation by numerous governmental authorities, principally by the FDA and
corresponding foreign agencies. The FDA administers the Federal Food, Drug and
Cosmetic Act and the regulations promulgated thereunder. We are subject to the
standards and procedures with respect to the manufacture of medical devices and
are subject to inspection by the FDA for compliance with such standards and
procedures.

     The FDA classifies medical devices into one of three classes depending on
the degree of risk associated with each medical device and the extent of control
needed to ensure safety and effectiveness. Our manual defibrillation and pacing
products have been classified by the FDA as Class II devices. Our AED products
have been classified as Class III devices. These devices must secure either a
510(k) pre-market notification clearance or an approved pre-market approval
application, or PMA, before they can be introduced into the United States
market. The process of obtaining 510(k) clearance typically takes several months
and may involve the submission of limited clinical data supporting assertions
that the product is substantially equivalent to another medical device on the
market prior to 1976. The PMA process typically requires substantially more time
than does 510(k) clearance and requires the submission

                                       35
<PAGE>   37

of significant quantities of clinical data and supporting information. Delays in
obtaining either 510(k) or, if necessary, PMA clearance could have an adverse
effect on the introduction of future products.

     Every company that manufactures or assembles medical devices is required to
register with the FDA and to adhere to certain "good manufacturing practices
(per the FDA's Quality System Regulation)" which regulate the manufacture of
medical devices and prescribe record keeping procedures and provide for the
routine inspection of facilities for compliance with such regulations. The FDA
also has broad regulatory powers in the areas of clinical testing, marketing and
advertising of medical devices.

     Medical device manufacturers are routinely subject to periodic inspections
by the FDA. If the FDA believes that a company may not be operating in
compliance with applicable laws and regulations, it can:

     - place the company under observation and reinspect the facilities;

     - issue a warning letter apprising of violative conduct;

     - detain or seize products;

     - mandate a recall;

     - enjoin future violations; and

     - assess civil and criminal penalties against the company, its officers or
       its employees.

     We are also subject to regulation in each of the foreign countries in which
we sell our products. Many of the regulations applicable to our products in such
countries are similar to those of the FDA. However, the national health or
social security organizations of certain countries require our products to be
qualified before they can be marketed in those countries.

LEGAL PROCEEDINGS

     In the normal course of operations, we are involved in litigation arising
from commercial disputes and claims of former employees and other matters. We do
not believe any of these current claims will have a material impact on our
financial position or results of operations.

                                       36
<PAGE>   38

                                   MANAGEMENT

EXECUTIVE OFFICERS AND DIRECTORS

     The following table shows information about our executive officers and
directors as of January 10, 2000:

<TABLE>
<CAPTION>
                   NAME                     AGE                     POSITION
- ------------------------------------------  ---    ------------------------------------------
<S>                                         <C>    <C>
Richard A. Packer.........................  42     Chairman of the Board of Directors and
                                                   Chief Executive Officer
Donald R. Boucher.........................  47     Vice President -- Research and Development
Steven K. Flora...........................  48     Vice President -- North American Sales
Ward M. Hamilton..........................  52     Vice President -- Marketing
E.J. Jones................................  57     Vice President -- International Sales
A. Ernest Whiton..........................  38     Vice President -- Administration and Chief
                                                   Financial Officer
James W. Biondi...........................  43     Director
Willard M. Bright.........................  85     Director
Thomas M. Claflin, II.....................  58     Director
M. Stephen Heilman........................  66     Director
Daniel M. Mulvena.........................  51     Director
</TABLE>

     Richard A. Packer joined the Company in 1992 and in November 1999, was
appointed Chairman of the Board of Directors and Chief Executive Officer. Mr.
Packer served as President, Chief Operating Officer and Director from May 1996
to his appointment as CEO. Since 1992 he has served as Chief Financial Officer
and Vice President of Operations of the Company. From 1987 to 1992, Mr. Packer
served as Vice President of various functions for Whistler Corporation, a
consumer electronics company. Prior to this, Mr. Packer was a manager with the
consulting firm of PRTM/KPMG, specializing in operations of high technology
companies. Mr. Packer has received B.S. and M. Eng. degrees from the Rensselaer
Polytechnic Institute and an M.B.A. from the Harvard Graduate School of Business
Administration.

     Donald R. Boucher joined the Company as Vice President of Research and
Development in December 1993. Prior to joining the Company, Mr. Boucher served
from 1977 to 1993, with Corometrics Medical Systems, Inc., a manufacturer of
fetal and neonatal monitors, most recently as Vice President of Engineering. Mr.
Boucher received an M.B.A. from the University of Connecticut, an M.S.E. in
bioengineering from the University of Pennsylvania, and a B.S. in engineering
from Northeastern University.

     Steven K. Flora joined the Company as Vice President of North American
Sales in September 1998. Prior to joining the Company, Mr. Flora served from
1981 to 1998 in various positions with Marquette Medical systems, a manufacturer
of cardiovascular and physiological monitoring systems, most recently as Vice
President of Sales. Mr. Flora received his B.S. in Biology from the University
of Illinois.

     Ward M. Hamilton joined the Company as Vice President of Marketing in
February 1992. Prior to this time, Mr. Hamilton served from 1985 to 1991 as
Director of New Business Development and Director of Marketing for ACLS products
for Laerdal Medical Corporation, a manufacturer of portable automated
defibrillators, and from 1977 to 1985 as Marketing Manager for defibrillators
and noninvasive blood pressure monitors for Datascope Corporation. Mr. Hamilton
received a B.A. in political science from Hartwick College and an M.P.A. in
public administration from the University of Southern California.

     E.J. Jones joined the Company as Vice President of International Sales in
November 1999. Prior to joining the Company, Mr. Jones was Vice President of
Operations with Apple Medical Corporation. He

                                       37
<PAGE>   39

also spent 15 years with Millipore Corporation, holding various positions in
Domestic and International Sales. Mr. Jones holds a B.S. in
Microbiology/Biochemistry from the University of Illinois and is a graduate of
the Advanced Management Program from the Harvard Business School.

     A. Ernest Whiton joined the Company as Vice President of Administration and
Chief Financial Officer in January 1999. Prior to joining the Company, Mr.
Whiton was Vice President and Chief Accounting officer of Ionics, Inc., a global
separations technology company, which he joined in 1993. Prior to Ionics, he was
a manager at Price Waterhouse. Mr. Whiton has received a B.S. in Accounting from
Bentley College and an M.B.A. from the Harvard Graduate School of Business
Administration.

     James W. Biondi joined the Company as a Director in 1999. Dr. Biondi has
served as Chairman of Cardiopulmonary Corp. since its founding in 1988, and
Chief Executive Officer and President since 1992. Cardiopulmonary Corp. designs,
develops, and assembles advanced software driven ventilators used for the
treatment of anesthesia and intensive care patients. Since 1992, Dr. Biondi has
been an Adjunct Assistant Professor of Medicine at Yale University School of
Medicine. Dr. Biondi also serves as director of Ivy Biomedical Systems, Inc.

     Willard M. Bright joined the Company in 1983, and previously served as the
Chairman of the Board of Directors of the Company. Prior to joining the Company,
Dr. Bright served as President and Chief Executive Officer of The Kendall
Company and Boehringer Mannheim Corporation, medical products manufacturers, and
President and director of Curtiss-Wright Corp., an aerospace and industrial
products manufacturer. Dr. Bright is a director of MacroChem Corporation.

     Thomas M. Claflin, II, joined the Company as a Director in 1980. Mr.
Claflin is a principal of Claflin Capital Management, Inc., a venture capital
firm, and general partner of its venture capital partnerships.

     M. Stephen Heilman joined the Company as a Director in 1996. Dr. Heilman
founded and has served as Chairman and Chief Executive Officer of Lifecor, Inc.,
a medical device company, since its inception in 1986. Dr. Heilman also founded
and has served as Chairman and Chief Executive Officer of Vascor, Inc. since its
inception in 1986, and also founded Medrad Inc. in 1964. Dr. Heilman is a
director of SkyMark Corporation, Medrad Inc. and Precision Therapeutics.

     Daniel M. Mulvena joined the Company as a Director in 1998. Mr. Mulvena is
the owner of Commodore Associates, Inc., a consulting company. From 1992 to
1995, Mr. Mulvena was a Group Vice President of Boston Scientific Corporation.
Mr. Mulvena serves as Chairman of the Board of Directors of Echo-cath, Inc. and
Magna Lab, Inc. He is also a director of Thoratec Laboratories, Inc.

                                       38
<PAGE>   40

                             PRINCIPAL STOCKHOLDERS

     The following table shows information regarding beneficial ownership of our
common stock as of January 10, 2000 by:

     - each of our directors and executive officers;

     - all directors and officers as a group; and

     - each person known by us to be the beneficial owner of more than five
       percent of our common stock.

<TABLE>
<CAPTION>
                                                                                              PERCENT OF
                                                                                             COMMON STOCK
                                                                  NUMBER OF               BENEFICIALLY OWNED
                                                                    SHARES                -------------------
                                                                 BENEFICIALLY              BEFORE     AFTER
              NAME OF BENEFICIAL OWNER                              OWNED                 OFFERING   OFFERING
- -----------------------------------------------------            ------------             --------   --------
<S>                                                    <C>                                <C>        <C>
Richard A. Packer(1).................................               51,550                     *          *
Steven K. Flora(2)...................................               13,800                     *          *
Ward M. Hamilton(3)..................................               53,500                     *          *
E.J. Jones(4)........................................               10,100                     *          *
A. Ernest Whiton(5)..................................               10,000                     *          *
James W. Biondi(6)...................................                3,500                     *          *
Willard M. Bright(7).................................              119,200                   1.7%       1.4%
Thomas M. Claflin, II(8).............................               69,245                   1.0          *
M. Stephen Heilman(9)................................               56,500                     *          *
Daniel M. Mulvena(10)................................                2,500                     *          *
All executive officers and directors as a group (10
  persons)(11).......................................              389,895                   5.5        4.6
The Kaufmann Fund, Inc.(12)..........................              910,900                  13.3       11.1
  140 E. 45th St., 43rd Floor Suite 2624 New York,
  New York 10017
Wellington Management Company, LLP(13)...............              630,700                   9.2        7.7
  75 State Street Boston, Massachusetts 02109
Pilgrim Baxter & Associates, Ltd.(14)................              502,500                   7.3        6.1
  825 Duportail Road Wayne, Pennsylvania 19087
Dimensional Fund Advisors Inc.(15)...................              415,200                   6.1        5.0
  1299 Ocean Avenue, 11th Floor Santa Monica, CA
  90401
</TABLE>

- ---------------
*    Less than one percent.

(1) Includes 38,250 shares of common stock issuable upon exercise of stock
    options which are exercisable within 60 days after January 10, 2000. Does
    not include options to purchase 103,750 shares of common stock which are not
    exercisable within 60 days after January 10, 2000.

(2) Includes 10,000 shares of common stock issuable upon exercise of options
    which are exercisable within 60 days after January 10, 2000. Does not
    include options to purchase 30,000 shares of common stock which are not
    exercisable within 60 days after January 10, 2000.

(3) Represents 53,500 shares of common stock issuable upon exercise of options
    which are exercisable within 60 days after January 10, 2000. Does not
    include options to purchase 7,500 shares of common stock which are not
    exercisable within 60 days after January 10, 2000.

                                       39
<PAGE>   41

 (4) Includes 10,000 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 30,000 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

 (5) Represents 10,000 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 30,000 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

 (6) Includes 2,500 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 7,500 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

 (7) Represents 111,700 shares of common stock held by the Willard M. Bright
     Revocable Inter Vivos Trust dated August 2, 1990 and 7,500 shares of common
     stock issuable upon exercise of options which are exercisable within 60
     days after January 10, 2000. Does not include options to purchase 7,500
     shares of common stock which are not exercisable within 60 days after
     January 10, 2000.

 (8) Includes 229 shares of common stock held by Mr. Claflin's spouse and 3,278
     shares held by various Claflin Capital Management, Inc. partnership
     entities, as to which Mr. Claflin disclaims beneficial ownership, and 5,000
     shares of common stock issuable upon exercise of options which are
     exercisable within 60 days after January 10, 2000. Does not include options
     to purchase 5,000 shares of common stock which are not exercisable within
     60 days after January 10, 2000.

 (9) Includes 7,500 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 5,000 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

(10) Includes 2,500 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 7,500 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

(11) Includes 146,750 shares of common stock issuable upon exercise of options
     which are exercisable within 60 days after January 10, 2000. Does not
     include options to purchase 233,750 shares of common stock which are not
     exercisable within 60 days after January 10, 2000.

(12) Based on information set forth in a Schedule 13G/A filed under the Exchange
     Act on February 18, 1998.

(13) Based on information set forth in a Schedule 13G filed under the Exchange
     Act on August 10, 1999.

(14) Based on information set forth in a Schedule 13G filed under the Exchange
     Act on January 7, 2000.

(15) Based on information set forth in a Schedule 13G filed under the Exchange
     Act on February 11, 1999.

                  RELATIONSHIPS AND RELATED PARTY TRANSACTIONS

     M. Stephen Heilman is Founder, Chairman and Chief Executive Officer of
Lifecor, Inc., in which we have made a $2 million investment. Pursuant to an
agreement entered into in connection with such investment, we have agreed to Mr.
Heilman serving as a director of the Company, and a representative of the
Company serving as a director of Lifecor, Inc.

     On January 7, 1999, we entered into an agreement with Elliott Associates,
L.P. and Westgate International, L.P., shareholders of the Company who together
owned approximately 15.4% of our Common Stock as of such date. Pursuant to the
terms of the agreement, Elliott and Westgate proposed, and we agreed, that the
Board of Directors would be expanded to eight members and Dr. James W. Biondi
would be elected as a Director to fill the resulting vacancy. On January 7,
1999, Dr. Biondi became a Director. Elliott and Westgate are no longer
significant shareholders of the Company.

                                       40
<PAGE>   42

                                  UNDERWRITING

     Subject to the terms and conditions stated in the underwriting agreement,
each underwriter named below has severally agreed to purchase, and we have
agreed to sell to such underwriter, the number of shares set forth opposite the
name of such underwriter.

<TABLE>
<CAPTION>
                                                               NUMBER
                            NAME                              OF SHARES
                            ----                              ---------
<S>                                                           <C>
Salomon Smith Barney Inc. ..................................
U.S. Bancorp Piper Jaffray, Inc. ...........................
Adams, Harkness & Hill, Inc. ...............................
                                                              --------
     Total..................................................
                                                              ========
</TABLE>

     The underwriting agreement provides that the obligations of the several
underwriters to purchase the shares included in this offering are subject to
approval of legal matters by counsel and to other conditions, including receipt
of certificates from us, receipt of letters from our accountants, the status of
the trading of our common stock on Nasdaq or securities on the New York Stock
Exchange or Nasdaq and the absence of a banking moratorium, hostilities or a
crisis. The underwriters are obligated to purchase all the shares (other than
those covered by their over-allotment option described below) if they purchase
any of the shares.

     The underwriters propose to offer some of the shares directly to the public
at the public offering price set forth on the cover page of this prospectus and
some of the shares to certain dealers at the public offering price less a
concession not in excess of $     per share. The underwriters may allow, and
such dealers may reallow, a concession not in excess of $     per share on sales
to other dealers. If all the shares are not sold at the initial offering price,
the representatives may change the public offering price and the other selling
terms.

     We have granted to the underwriters a 30-day option to purchase up to an
additional 210,000 shares to cover over-allotments, if any, at the public
offering price less the underwriting discount. The underwriters may exercise
this option solely for the purpose of covering over-allotments, if any, in
connection with this offering. To the extent this option is exercised, each
underwriter will be obligated, subject to the conditions stated above, to
purchase a number of additional shares approximately proportionate to such
underwriter's initial purchase commitment.

     We, our officers and directors and some of our non-institutional
stockholders have agreed that, for a period of 90 days from the date of this
prospectus, they will not, without the prior written consent of Salomon Smith
Barney Inc., dispose of or hedge any shares of our common stock or any
securities convertible into, or exercisable or exchangeable for common stock.
Salomon Smith Barney Inc. in its sole discretion may release any of the
securities subject to these lock-up agreements at any time without notice.

     The common stock is quoted on the Nasdaq National Market under the symbol
"ZOLL."

     The following table shows the underwriting discounts and commissions to be
paid to the underwriters by us in connection with this offering. These amounts
are shown assuming both no exercise and full exercise of the underwriters'
option to purchase additional shares of common stock.

<TABLE>
<CAPTION>
                                                                      PAID BY ZOLL
                                                              ----------------------------
                                                              NO EXERCISE    FULL EXERCISE
                                                              -----------    -------------
<S>                                                           <C>            <C>
Per share...................................................   $               $
Total.......................................................   $               $
</TABLE>

     In connection with this offering Salomon Smith Barney Inc., on behalf of
the underwriters, may purchase and sell shares of common stock in the open
market. These transactions may include over-allotment, syndicate covering
transactions and stabilizing transactions. Over-allotment involves syndicate
sales of common stock in excess of the number of shares to be purchased by the
underwriters in this

                                       41
<PAGE>   43

offering, which creates a syndicate short position. Syndicate covering
transactions involve purchases of the common stock in the open market after the
distribution has been completed in order to cover syndicate short positions.
Stabilizing transactions consist of certain bids for or purchases of common
stock made for the purpose of preventing or retarding a decline in the market
price of the common stock while this offering is in progress.

     The underwriters also may impose a penalty bid. Penalty bids permit the
underwriters to reclaim a selling concession from a syndicate member when
Salomon Smith Barney Inc., in covering syndicate short positions or making
stabilizing purchases, repurchases shares originally sold by that syndicate
member.

     Any of these activities may cause the price of the common stock to be
higher than the price that otherwise would exist in the open market in the
absence of such transactions. These transactions may be effected on the Nasdaq
National Market or in the over-the-counter market, or otherwise and, if
commenced, may be discontinued at any time.

     In addition, in connection with this offering, the underwriters (and
selling group members) may engage in passive market making transactions in the
common stock on the Nasdaq National Market, prior to the pricing and completion
of the offering. Passive market making consists of displaying bids on the Nasdaq
National Market no higher than the bid prices of independent market makers and
making purchases at prices no higher than those independent bids and effected in
response to order flow. Net purchases by a passive market maker on each day are
limited to a specified percentage of the passive market maker's average daily
trading volume in the common stock during a specified period and must be
discontinued when such limit is reached. Passive market making may cause the
price of the common stock to be higher than the price that otherwise would exist
in the open market in the absence of such transactions. If passive market making
is commenced, it may be discontinued at any time.

     We estimate that the total expenses, excluding underwriting discounts and
commissions, of this offering will be $700,000.

     We have agreed to indemnify the underwriters against liabilities to which
they may become subject, including liabilities that may arise under the
Securities Act of 1933, the Securities Exchange Act of 1934 or other federal or
state statutory law or regulation, at common law or otherwise or to contribute
to payments the underwriters may be required to make in respect of any of those
liabilities.

                                       42
<PAGE>   44

                                 LEGAL MATTERS

     The validity of the common stock offered in this prospectus will be passed
upon for Zoll by Goodwin, Procter & Hoar LLP, Boston, Massachusetts. Other legal
matters in connection with this offering will be passed upon for the
underwriters by Cravath, Swaine & Moore, New York, New York.

                                    EXPERTS

     Ernst & Young LLP, independent auditors, have audited our supplemental
combined financial statements at September 26, 1998 and October 2, 1999, and for
each of the three years in the period ended October 2, 1999, as set forth in
their report which is included in this prospectus and elsewhere in the
registration statement. Ernst & Young LLP have also audited our consolidated
financial statements and schedule included in our Annual Report on Form 10-K for
the year ended October 2, 1999, as set forth in their report, which is
incorporated by reference in this prospectus and elsewhere in the registration
statement. We have both included our supplemental combined financial statements
and incorporated by reference our consolidated financial statements and schedule
in this prospectus and elsewhere in the registration statement in reliance on
Ernst & Young LLP's reports, given on their authority as experts in accounting
and auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other
information with the Securities and Exchange Commission, or the SEC. You may
read and copy any document we file at the public reference facilities of the SEC
located at 450 Fifth Street, N.W., Washington D.C. 20549. You may obtain
information on the operation of the SEC's public reference facilities by calling
the SEC at 1-800-SEC-0330. You can also access copies of such material
electronically on the SEC's home page on the World Wide Web at
http://www.sec.gov.

     This prospectus is part of a registration statement (Registration No.
333-               ) we filed with the SEC. The SEC permits us to "incorporate
by reference" the information that we file with them, which means that we can
disclose important information to you by referring you to those documents. The
information incorporated by reference is considered to be part of this
prospectus, and information that we file with the SEC after the date of this
prospectus will automatically update and supersede this information. We
incorporate by reference the following documents filed by us with the SEC (File
No. 000-20225). We also incorporate by reference any future filings made with
the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act
of 1934, as amended, after the date of this prospectus until the termination of
this offering:

     1. Our Annual Report on Form 10-K for the fiscal year ended October 2,
        1999.

     2. Our Proxy Statement dated January 10, 2000 filed in connection with our
        Annual Meeting of Shareholders to be held on February 8, 2000.

     3. The description of our common stock which is contained in our
        registration statement on Form 8-A filed under the Exchange Act on May
        15, 1992, including any amendments or reports filed for the purpose of
        updating such description.

     If you request a copy of any or all of the documents incorporated by
reference, we will send to you the copies requested at no charge. However, we
will not send exhibits to such documents, unless such exhibits are specifically
incorporated by reference in such documents. You should direct requests for such
copies to: Zoll Medical Corporation, 32 Second Avenue, Burlington, Massachusetts
01803, Attention: Chief Financial Officer. Our telephone number is (781)
229-0020.

                                       43
<PAGE>   45

                            ZOLL MEDICAL CORPORATION

                   SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS
                                OCTOBER 2, 1999

                                    CONTENTS

<TABLE>
<S>                                                           <C>
Report of Independent Auditors..............................  F-2
Supplemental Combined Balance Sheets........................  F-3
Supplemental Combined Income Statements.....................  F-4
Supplemental Combined Statements of Stockholders' Equity....  F-5
Supplemental Combined Statements of Cash Flows..............  F-6
Notes to Supplemental Combined Financial Statements.........  F-7
</TABLE>

                                       F-1
<PAGE>   46

                         REPORT OF INDEPENDENT AUDITORS

Board of Directors and Stockholders
ZOLL Medical Corporation

     We have audited the supplemental combined balance sheets of ZOLL Medical
Corporation as of October 2, 1999 and September 26, 1998 and the related
supplemental combined statements of income, shareholders' equity, and cash flows
for each of the three years in the period ended October 2, 1999. The
supplemental combined financial statements give retroactive effect to the merger
of ZOLL Medical Corporation and Pinpoint Technologies, Inc. on October 15, 1999,
which has been accounted for using the pooling of interests method as described
in the notes to the supplemental combined financial statements. These
supplemental combined financial statements are the responsibility of the
management of ZOLL Medical Corporation. Our responsibility is to express an
opinion on these supplemental financial statements based on our audits.

     We conducted our audits in accordance with auditing standards generally
accepted in the United States. Those standards require that we plan and perform
the audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements. An
audit also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

     In our opinion, based on our audits, the supplemental combined financial
statements referred to above present fairly, in all material respects, the
combined financial position of ZOLL Medical Corporation at October 2, 1999 and
September 26, 1998, and the combined results of its operations and its cash
flows for each of the three years in the period ended October 2, 1999, after
giving retroactive effect to the merger of Pinpoint Technologies, Inc., as
described in the notes to the supplemental combined financial statements, in
conformity with accounting principles generally accepted in the United States.

                                            ERNST & YOUNG LLP

Boston, Massachusetts
November 12, 1999

                                       F-2
<PAGE>   47

                            ZOLL MEDICAL CORPORATION

                      SUPPLEMENTAL COMBINED BALANCE SHEETS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                              SEPTEMBER 26,    OCTOBER 2,
                                                                  1998            1999
                                                              -------------    ----------
<S>                                                           <C>              <C>
ASSETS
Current assets:
  Cash and cash equivalents.................................     $ 5,521        $ 1,821
  Accounts receivable, less allowance of $940 at September
     30, 1998 and $2,096 at October 2, 1999.................      14,630         25,464
  Inventories:
     Raw materials..........................................       3,990          5,332
     Work-in-process........................................       1,735          2,623
     Finished goods.........................................       3,680          5,241
                                                                 -------        -------
                                                                   9,405         13,196
  Prepaid expenses and other current assets.................       3,257          2,296
                                                                 -------        -------
Total current assets........................................      32,813         42,777
Property and equipment at cost:
  Land and building.........................................       1,032          3,432
  Machinery and equipment...................................      12,791         15,382
  Construction in progress..................................       1,162            477
  Tooling...................................................       2,225          2,695
  Furniture and fixtures....................................         712            883
  Leasehold improvements....................................         737            737
                                                                 -------        -------
                                                                  18,659         23,606
Less accumulated depreciation...............................       8,187         10,875
                                                                 -------        -------
Net property and equipment..................................      10,472         12,731
Other assets, net of accumulated amortization of $496 at
  September 26, 1998 and $711 at October 2, 1999............       3,371          4,179
                                                                 -------        -------
                                                                 $46,656        $59,687
                                                                 =======        =======
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Accounts payable..........................................     $ 2,902        $ 8,404
  Accrued expenses and other liabilities....................       7,724          6,958
  Current maturities of long-term debt......................         116            164
  Deferred revenue..........................................         393            523
                                                                 -------        -------
Total current liabilities...................................      11,135         16,049
Deferred income taxes.......................................         288            347
Long-term debt..............................................         446          2,069
Commitments and contingencies
Stockholders' equity:
  Preferred stock, $.01 par value, authorized 1,000 shares,
     none issued and outstanding............................          --             --
  Common stock, $.02 par value, authorized 19,000 shares,
     6,602 and 6,772 issued and outstanding at September 26,
     1998 and October 2, 1999 respectively..................         132            136
  Capital in excess of par value............................      20,683         22,439
  Retained earnings.........................................      13,972         18,647
                                                                 -------        -------
Total stockholders' equity..................................      34,787         41,222
                                                                 -------        -------
                                                                 $46,656        $59,687
                                                                 =======        =======
</TABLE>

            See notes to supplemental combined financial statements.
                                       F-3
<PAGE>   48

                            ZOLL MEDICAL CORPORATION

                    SUPPLEMENTAL COMBINED INCOME STATEMENTS

<TABLE>
<CAPTION>
                                                                          YEAR ENDED
                                                         --------------------------------------------
                                                         SEPTEMBER 27,    SEPTEMBER 26,    OCTOBER 2,
                                                             1997             1998            1999
                                                         -------------    -------------    ----------
                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                      <C>              <C>              <C>
Net sales..............................................     $57,833          $57,520        $78,682
Cost of goods sold.....................................      25,372           24,268         32,486
                                                            -------          -------        -------
Gross profit...........................................      32,461           33,252         46,196
Expenses:
  Selling and marketing................................      18,484           20,152         24,364
  General and administrative...........................       6,749            6,239          7,422
  Research and development.............................       6,430            6,583          6,916
                                                            -------          -------        -------
Total expenses.........................................      31,663           32,974         38,702
                                                            -------          -------        -------
Income from operations.................................         798              278          7,494
Investment income......................................         432              487            124
Interest expense.......................................          77               74            169
                                                            -------          -------        -------
Income before income taxes.............................       1,153              691          7,449
Provision for income taxes.............................         266               18          2,010
                                                            -------          -------        -------
Net income.............................................     $   887          $   673        $ 5,439
                                                            =======          =======        =======
Basic earnings per common share........................     $  0.13          $  0.10        $  0.82
                                                            =======          =======        =======
Weighted average common shares outstanding.............       6,602            6,602          6,656
Diluted earnings per common and equivalent share.......     $  0.13          $  0.10        $  0.79
                                                            =======          =======        =======
Weighted average common and equivalent shares
  outstanding..........................................       6,650            6,647          6,893
</TABLE>

UNAUDITED PRO FORMA INFORMATION (NOTE B):

<TABLE>
<S>                                                           <C>
Combined income before income taxes.........................  $  7,449
  Pro forma incremental operating costs.....................       272
                                                              --------
  Pro forma income before income taxes......................     7,177
  Pro forma provision for income taxes......................     2,402
                                                              --------
  Pro forma net income......................................  $  4,775
                                                              ========
  Pro forma diluted earnings per share......................  $   0.69
                                                              ========
</TABLE>

            See notes to supplemental combined financial statements.
                                       F-4
<PAGE>   49

                            ZOLL MEDICAL CORPORATION

            SUPPLEMENTAL COMBINED STATEMENTS OF STOCKHOLDERS' EQUITY

<TABLE>
<CAPTION>
                                                               CAPITAL IN                  TOTAL
                                             COMMON            EXCESS OF    RETAINED   STOCKHOLDERS'
                                             SHARES   AMOUNT   PAR VALUE    EARNINGS      EQUITY
                                             ------   ------   ----------   --------   -------------
                                                                 (IN THOUSANDS)
<S>                                          <C>      <C>      <C>          <C>        <C>
BALANCE AT SEPTEMBER 28, 1996..............  6,543     $131     $20,533     $12,950       $33,614
Exercise of stock options..................     18                   59                        59
  Tax benefit realized upon exercise of
     stock options.........................                          43                        43
  Distributions by Pinpoint Technologies,
     Inc...................................                                    (140)         (140)
  Net income...............................                                     887           887
                                             -----     ----     -------     -------       -------
BALANCE AT SEPTEMBER 27, 1997..............  6,561      131      20,635      13,697        34,463
  Issuance of common stock by Pinpoint
     Technologies, Inc. (See Note A).......     41        1          48                        49
  Adjustments to conform pooled companies
     fiscal year-ends......................                                    (140)         (140)
  Distributions by Pinpoint Technologies,
     Inc...................................                                    (258)         (258)
  Net income...............................                                     673           673
                                             -----     ----     -------     -------       -------
BALANCE AT SEPTEMBER 26, 1998..............  6,602      132      20,683      13,972        34,787
  Exercise of stock options................    147        3       1,129                     1,132
  Tax benefit realized upon exercise of
     stock options.........................                         628                       628
  Initial capitalization of Pinpoint
     Property Management, LLC (See Note
     A)....................................     23        1          (1)                       --
  Contributions by Pinpoint Technologies,
     Inc. shareholders.....................                                     550           550
  Distribution by Pinpoint Technologies,
     Inc...................................                                  (1,314)       (1,314)
  Net income...............................                                   5,439         5,439
                                             -----     ----     -------     -------       -------
BALANCE AT OCTOBER 2, 1999.................  6,772     $136     $22,439     $18,647       $41,222
                                             =====     ====     =======     =======       =======
</TABLE>

            See notes to supplemental combined financial statements.
                                       F-5
<PAGE>   50

                            ZOLL MEDICAL CORPORATION

                 SUPPLEMENTAL COMBINED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                           YEAR ENDED
                                                           -------------------------------------------
                                                           SEPTEMBER 27,    SEPTEMBER 26,   OCTOBER 2,
                                                               1997             1998           1999
                                                           -------------    -------------   ----------
                                                                         (IN THOUSANDS)
<S>                                                        <C>              <C>             <C>
Operating activities:
Net income.............................................       $   887          $   673       $  5,439
Charges not affecting cash:
  Depreciation and amortization........................         1,418            1,478          3,035
  Issuance of common stock for services................            --               49          1,294
  Accounts receivable allowances.......................           361              243             --
  Inventory reserve....................................           318               53            129
  Provision for warranty expense.......................           275              (43)           180
  Deferred income taxes................................          (898)             188           (339)
  In-process research and development..................         1,000               --             --
Changes in current assets and liabilities:
  Accounts receivable..................................         1,102              114        (12,129)
  Inventories..........................................          (408)          (1,982)        (3,920)
  Prepaid expenses and other current assets............           (23)          (1,715)         1,358
  Accounts payable and accrued expenses................         1,739            1,133          4,556
  Deferred revenue.....................................           116               79            130
                                                              -------          -------       --------
Cash provided by (used for) operating activities.......         5,887              270           (267)

Investing activities:
  Additions to property and equipment..................        (1,801)          (4,493)        (2,930)
  Investment in marketable securities..................        (2,575)          (2,675)          (419)
  Redemption of marketable securities..................         5,262            2,953            419
  Other assets.........................................          (166)             (62)        (1,002)
  Acquisition of assets from Westech Information
     Systems, Inc......................................        (1,558)              (3)            --
                                                              -------          -------       --------
Cash used for investing activities.....................          (838)          (4,280)        (3,932)

Financing activities:
  Exercise of stock options, including income tax
     benefits..........................................           102               --          1,760
  Distributions to stockholders........................          (140)            (258)        (1,314)
  Contributions from stockholders......................            --               --            550
  Repayment of long-term debt..........................          (160)            (127)          (497)
                                                              -------          -------       --------
Cash provided by (used for) financing activities.......          (198)            (385)           499
                                                              -------          -------       --------

Net increase (decrease) in cash........................         4,851           (4,395)        (3,700)
Cash and cash equivalents at beginning of year(1)......         5,107            9,916          5,521
                                                              -------          -------       --------
Cash and cash equivalents at end of year...............       $ 9,958          $ 5,521       $  1,821
                                                              =======          =======       ========
</TABLE>

- ---------------
(1) Pinpoint Technologies, Inc.'s December 31 year-end was changed to conform
    with ZOLL Medical Corporation's September 26, 1998 year-end (see Note A)

<TABLE>
<S>                                                      <C>           <C>              <C>
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the year:
  Income taxes.........................................   $    551        $ 1,002          $   555
  Interest.............................................         77             74              169
Non-cash transaction:
  Long-term debt incurred in purchase of assets........                                    $ 1,800
</TABLE>

            See notes to supplemental combined financial statements.
                                       F-6
<PAGE>   51

                            ZOLL MEDICAL CORPORATION

              NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS

NOTE A -- SIGNIFICANT ACCOUNTING POLICIES

     Description of Business:  ZOLL Medical Corporation (the Company) designs,
manufactures and markets an integrated line of proprietary, non-invasive cardiac
resuscitation devices and disposable electrodes. The Company's products are used
for the emergency resuscitation of cardiac arrest victims. The Company also
designs and markets software, which automates collection and management of both
clinical and non-clinical data for emergency medical service providers.

     Basis of Presentation:  On October 15, 1999, the Company acquired Pinpoint
Technologies, Inc. and Pinpoint Property Management LLC (Pinpoint individually
and collectively) in a business combination accounted for as a pooling of
interests. Pinpoint, which creates, develops and manufactures advanced
information technology software, exclusively focused on the emergency medical
services (EMS)market, became a wholly owned subsidiary of the Company through
the exchange of approximately 433,000 shares of the company's common stock for
all of the outstanding stock of Pinpoint. In January 1999, Pinpoint distributed
cash to the stockholders of Pinpoint. All of the cash distributed was
contributed to newly formed Pinpoint Property Management LLC, and used to fund
the equity needed to acquire an office building (See Note G). The accompanying
supplemental combined financial statements are based on the assumption that the
companies were combined for all periods presented, and financial statements of
prior years have been restated to give effect to the combination. Prior to the
combination, Pinpoint had a December 31 fiscal year end. Subsequent to the
combination Pinpoint changed its year-end to the Saturday closest to September
30, to conform with that of the Company. The accompanying supplemental combined
financial statements reflect the combined historical results of the Company for
the periods ended September 27, 1997, September 26, 1998 and October 2, 1999,
and the results of Pinpoint for December 31, 1997, September 26, 1998, and
October 2, 1999. An adjustment for $140,000 was reflected in the Combined
Statements of Stockholders' Equity to eliminate the effect of including
Pinpoint's results of operations for the three months ended December 31, 1997,
in both the years ended September 27, 1997 and September 26, 1998. These
supplemental financial statements are supplemental to, rather than in place of
the historical financial statements. The supplemental combined financial
statements will become the historical financial statements upon issuance of the
interim financial statements of the Company for the quarter ended January 1,
2000.

     Principles of Consolidation:  The supplemental combined financial
statements include the accounts of the Company and its wholly owned subsidiaries
and Pinpoint Technologies, Inc. and Pinpoint Property Management LLC. All
significant intercompany accounts and transactions have been eliminated.

     Fiscal Year:  The Company's fiscal year ends on the Saturday closest to
September 30. The year ended October 2, 1999 included 53 weeks and the years
ended September 26, 1998 and September 27, 1997 included 52 weeks.

     Cash and Cash Equivalents:  The Company considers all highly liquid
instruments with an original maturity of three months or less to be cash
equivalents. Substantially all cash and cash equivalents are invested in a money
market investment account. These amounts are stated at cost which approximates
market.

     Inventories:  Inventories, principally purchased parts, are valued at the
lower of first-in, first-out (FIFO) cost or market. Market is replacement value
for raw materials and net realizable value, after allowance for estimated costs
of completion and disposal, for work-in-process and finished goods.

     Intangible Assets:  Patents and software are stated at cost and amortized
using the straight-line method. The excess of cost over fair value of the net
assets acquired is amortized on a straight-line basis over 15 years. Prepaid
license fees are amortized over the term of the related contract, once
commercialization of the related product begins.

                                       F-7
<PAGE>   52
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

     Property and Equipment:  Property and equipment are stated at cost and are
depreciated using the straight-line method over the estimated economic useful
lives of the assets (forty years for buildings, three to ten years for machinery
and equipment, and five to seven years for tooling and furniture and fixtures).
Leasehold improvements and equipment under capital leases are being amortized
over the life of the lease.

     Revenue Recognition:  Revenue from product sales is recognized upon
shipment of the product and recorded net of estimated returns. The Company
licenses software under the non-cancelable license agreements and provides
services including training, installation, consulting and maintenance,
consisting of product support services and periodic updates. Revenue from the
sale of software is recognized in accordance with the American Institute of
Certified Public Accountants (AICPA) Statement of Position (SOP) 97-2, Software
Revenue Recognition. License fee revenues are generally recognized when a non-
cancelable license agreement has been signed, the software product has been
shipped, there are no uncertainties surrounding product acceptance, the fees are
fixed and determinable, and collection is considered probable. For customer
license agreements, which meet these recognition criteria, the portion of the
fees related to software licenses will generally be recognized in the current
period, while the portion of the fees related to services is recognized as the
services are performed. The Company allocates a portion of contractual license
fees to post-contract support activities covered under the contract including
first year maintenance, installation assistance and limited training services.
In addition, the Company also allocates a portion of the contractual license
fees to future unspecified upgrade rights. Revenues from maintenance agreements
and upgrade rights are recognized ratably over a three month period, and a one
year period, respectively.

     Advertising Costs:  Advertising costs are expensed as incurred and totaled
$381,000, $409,000 and $481,000 in 1997, 1998 and 1999, respectively.

     Product Warranty:  Expected future product warranty costs, included in
accrued expenses and other liabilities, are recognized at the time of sale for
all products covered under warranty. Warranty periods range from one to five
years.

     Foreign Currency:  The financial position and results of operations of the
Company's foreign subsidiaries are measured using the U.S. dollar as the
functional currency. All material translation and transaction gains and losses
are recorded in the income statement.

     Earnings Per Share:  In 1998, the Company adopted Statement of Financial
Accounting Standards No. 128, "Earnings per Share," which requires the
presentation of basic and diluted earnings per share amounts. All periods
presented have been restated to reflect adoption of this statement.

     The shares used for basic earnings per common share and diluted earnings
per common share are reconciled as follows (in thousands):

<TABLE>
<CAPTION>
                                                              1997     1998     1999
                                                              -----    -----    -----
<S>                                                           <C>      <C>      <C>
Average shares outstanding for basic earnings per share.....  6,602    6,602    6,656
Dilutive effect of stock options............................     48       45      237
                                                              -----    -----    -----
Average shares outstanding for diluted earnings per share...  6,650    6,647    6,893
                                                              =====    =====    =====
</TABLE>

     Reclassifications:  Certain reclassifications have been made to the prior
years' combined financial statements to conform to the 1998 presentation.

     Use of Estimates:  The preparation of the financial statements in
conformity with generally accepted accounting principles requires management to
make estimates and assumptions that affect the reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the

                                       F-8
<PAGE>   53
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

financial statements and the reported amounts of revenues and expenses during
the reporting period. Actual results could differ from those estimates.

     Stock Option Plans:  The Company accounts for its stock compensation awards
under the provisions of APB No. 25, "Accounting for Stock Issued to Employees,"
and will continue to do so in the future.

     Segment Reporting:  Effective October 2, 1999, the Company adopted
Statement of Financial Accounting Standards No. 131, "Disclosure about Segments
of an Enterprise and Related Information" (SFAS 131). This statement supersedes
Statement No. 14, "Financial Reporting for Segments of a Business Enterprise."
SFAS 131 establishes standards for the way that public companies report
information about operating segments in annual financial statements and requires
that those enterprises report selected information about operating segments in
interim financial reports. SFAS 131 also establishes standards for disclosures
about products and services, geographic areas and major customers. The adoption
of SFAS 131 did not affect results of operations or financial position, but did
affect the disclosure of segment information. See Note N.

     Comprehensive Income:  In June 1997, the Financial Accounting Standards
Board issued Statement of Accounting Standards (SFAS) No. 130, "Reporting
Comprehensive Income." SFAS 130 establishes standards for reporting and
displaying comprehensive income. Comprehensive income is equal to net income for
each fiscal year presented.

     Recent Accounting Pronouncements:  In June 1998, the Financial Accounting
Standards Board issued Statement of Financial Accounting Standards No. 133,
"Accounting for Derivative Financial Instruments and for Hedging Activities,"
which provides a comprehensive and consistent standard for the recognition and
measurement of derivatives and hedging activities. SFAS 133 is effective for
years beginning after June 15, 2000 and is not anticipated to have a material
effect on the Company's financial statements when adopted.

NOTE B -- MERGER:

     Summarized results of operations of the separate companies for the
preceding three years are as follows (in thousands):

<TABLE>
<CAPTION>
                                                         ZOLL      PINPOINT    COMBINED
                                                        -------    --------    --------
<S>                                                     <C>        <C>         <C>
Year ended September 27, 1997
  Net sales...........................................  $56,336     $1,497     $57,833
  Net income..........................................      515        372         887
Year ended September 26, 1998
  Net sales...........................................  $55,080     $2,440     $57,520
  Net income..........................................       43        630         673
Year ended October 2, 1999
  Net sales...........................................  $73,977     $4,705     $78,682
  Net income..........................................    4,081      1,358       5,439
</TABLE>

     Sales and net income of $579,000 and $140,000, respectively, for the
quarter ended December 31, 1997 were included in the years ended September 27,
1997 and September 26, 1998.

     The following unaudited pro forma information has been prepared assuming
Pinpoint had been acquired as of the beginning of the periods presented. The pro
forma information is presented for informational purposes only and is not
necessarily indicative of what would have occurred if the acquisition had been
made as of those dates. In addition, the pro forma information is not intended
to be a projection

                                       F-9
<PAGE>   54
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

of future results and does not reflect synergies expected to result from the
integration of Pinpoint and the Company's Westech business.

     The pro forma income tax adjustment assumes Pinpoint was a taxable entity
subject to tax at ZOLL's incremental tax rate for the periods presented. The pro
forma operating costs are expected to be incurred as a result of the merger.

<TABLE>
<CAPTION>
                                                              1997    1998     1999
                                                              ----    ----    ------
                                                                  (IN THOUSANDS)
<S>                                                           <C>     <C>     <C>
Combined net income.........................................  $887    $673    $5,439
Pro forma income tax adjustment on Pinpoint's S Corporation
earnings....................................................   149     248       392
Pro forma incremental operating costs.......................    --      --       272
                                                              ----    ----    ------
Pro forma net income........................................  $738    $425    $4,775
                                                              ====    ====    ======
</TABLE>

NOTE C -- INVESTMENTS

     During 1996, the Company invested $2 million in the common stock of
Lifecor, Inc., which represents approximately 6% of Lifecor's outstanding common
stock. The Company accounts for this investment at cost, which approximates
market. This investment is included in other assets on the balance sheet.

NOTE D -- PREPAID EXPENSES AND OTHER CURRENT ASSETS

     Current assets consisted of:

<TABLE>
<CAPTION>
                                                              SEPTEMBER 26,    OCTOBER 2,
                                                                  1998            1999
                                                              -------------    ----------
                                                                    (IN THOUSANDS)
<S>                                                           <C>              <C>
Deferred income taxes.......................................     $1,124          $1,522
Insurance proceeds receivable -- See Note L.................      1,674              --
Other.......................................................        459             774
                                                                 ------          ------
Total prepaid expenses and other current assets.............     $3,257          $2,296
                                                                 ======          ======
</TABLE>

NOTE E -- STOCKHOLDERS' EQUITY

     Preferred Stock:  The Board of Directors is authorized to fix the
designations, relative rights, preferences and limitations on the Preferred
Stock at the time of issuance.

     On June 8, 1998, the Company's Board of Directors adopted a Shareholder
Rights Plan. In connection with the Shareholder Rights Plan, the Board of
Directors declared a dividend distribution of one Preferred Stock purchase right
for each outstanding share of Common Stock to stockholders of record as of the
close of business day on June 9, 1998. Initially, these rights will not be
exercisable and will trade with the shares of the Company's Common Stock. Under
the Shareholder Rights Plan, the rights generally become exercisable if a person
becomes an "acquiring person" by acquiring 15% or more of the Common Stock of
the Company, if a person who owns 10% or more of the Common Stock of the Company
is determined to be an "adverse person" by the Board of Directors or if a person
commences a tender offer that would result in that person owning 15% or more of
the Common Stock of the Company. Under the Shareholder Rights Plan, a
shareholder of the Company who beneficially owns 15% or more of the Company's
Common Stock as of June 9, 1998 generally will be deemed an "acquiring person"
if such shareholder acquires additional shares of the Company's Common Stock. In
the event that a person

                                      F-10
<PAGE>   55
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

becomes an "acquiring person" or is declared an "adverse person" by the Board,
each holder of a right (other than the acquiring person or the adverse person)
would be entitled to acquire such number of shares of Preferred Stock which are
equivalent to the Company's Common Stock having a value of twice the
then-current exercise price of the right. If the Company is acquired in a merger
or other business combination transaction after any such event, each holder of a
right would then be entitled to purchase, at the then-current exercise price,
shares of the acquiring company's common stock having a value twice the exercise
price of the right.

     Stock Purchase Rights:  On September 25, 1995, Pinpoint granted an employee
stock purchase rights which entitled the employee to obtain 3% of the then
existing shares at a nominal price. The stock purchase rights vest 25% at the
end of one year of employment, another 25% vesting over the next three years,
and the remaining 50% vesting over the next six years. The rights to purchase
12,650 shares of common stock automatically vested upon the acquisition of
Pinpoint. As of October 2, 1999, none of the stock purchase rights had been
exercised.

     Stock Option Plans:  The Company's 1983 and 1992 stock option plans provide
for the granting of options to officers and other key employees to purchase the
Company's Common Stock at a purchase price, in the case of incentive stock
options, at least equal to the fair market value per share of the outstanding
Common Stock of the Company at the time the option is granted, as determined by
the Compensation Committee of the Board of Directors. Options are no longer
granted under the 1983 plan. The options become exercisable ratably over two or
four years and have maximum duration of 10 years. The Company's Non-employee
Director Stock Option Plan provides for the granting of options to purchase
shares of Common Stock to Directors of the Company who are not also employees of
the Company or any subsidiary of the Company. The options vest in four equal
annual installments over a four year period. The options may be exercised at a
price equal to the fair market value of the Common Stock on the date the option
is granted.

     The number of shares authorized for these plans was 2,210,000.
Approximately 1,208,000 shares of Common Stock are reserved for issuance under
the Company's stock option plans as of October 2, 1999.

     The Company has adopted the disclosure-only provisions of Statement of
Financial Accounting Standards No. 123 (FAS 123), "Accounting for Stock-Based
Compensation." Accordingly, no compensation cost has been recognized with
respect to the Company's stock option grants. Had compensation cost for this
plan been determined based on the fair value methodology prescribed by FAS 123,
the Company's net earnings and earnings per share would have been reduced to the
pro forma amounts indicated below.

<TABLE>
<CAPTION>
                                                               1997        1998        1999
                                                             --------    --------    ---------
                                                              (IN THOUSANDS, EXCEPT PER SHARE
                                                                           DATA)
<S>                                                          <C>         <C>         <C>
Net income -- as reported..................................   $ 887       $ 673       $5,439
Net income -- pro forma....................................     641         313        4,956
Basic earnings per common and equivalent share-as
  reported.................................................   $0.13       $0.10       $ 0.82
Diluted earnings per common and equivalent share-as
  reported.................................................   $0.13       $0.10       $ 0.79
Basic earnings per common and equivalent share-pro forma...   $0.10       $0.05       $ 0.74
Diluted earnings per common and equivalent share-pro
  forma....................................................   $0.10       $0.05       $ 0.72
</TABLE>

     The above pro forma amounts may not be representative of the effects on
reported net earnings for future years. The fair value of each option grant is
estimated on the date of the grant using the Black-

                                      F-11
<PAGE>   56
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

Scholes option-pricing model with the following weighted-average assumptions
used for grants in 1999 and 1998:

<TABLE>
<CAPTION>
                                                           1997       1998       1999
                                                          -------    -------    -------
<S>                                                       <C>        <C>        <C>
Dividend yield..........................................       0%         0%         0%
Expected volatility.....................................    4.84%      6.48%      6.56%
Risk-free interest rate.................................    5.98%      4.53%      5.11%
Expected lives..........................................  5 years    5 years    5 years
</TABLE>

     Activity as to stock options under the two plans is as follows:

<TABLE>
<CAPTION>
                                                     1997                 1998                 1999
                                              ------------------   ------------------   ------------------
                                                       WEIGHTED-            WEIGHTED-            WEIGHTED-
                                                        AVERAGE              AVERAGE              AVERAGE
                                                       EXERCISE             EXERCISE             EXERCISE
                                              SHARES     PRICE     SHARES     PRICE     SHARES     PRICE
                                              ------   ---------   ------   ---------   ------   ---------
                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>      <C>         <C>      <C>         <C>      <C>
Outstanding at beginning of year............    731     $11.19      793      $11.02       909     $ 7.23
Granted during the year.....................     86       9.76      214        7.08       253      10.11
Exercised during the year...................    (18)      3.43       --          --      (147)      7.70
Cancelled during the year...................     (6)     12.55      (98)       9.05      (149)      6.06
                                               ----     ------      ---      ------      ----     ------
Outstanding at end of year..................    793     $11.02      909      $ 7.23       866     $ 7.98
                                               ----     ------      ---      ------      ----     ------
Available for grant at end of year..........    161                 145                   341
                                               ----                 ---                  ----
Weighted-average fair value of options
  granted during the year...................            $ 4.48               $ 4.12               $ 6.83
Weighted-average exercise price of options
  exercisable at end of year................            $10.08               $ 7.20               $ 7.14
</TABLE>

     The following table summarizes information about stock options outstanding
at October 2, 1999.

<TABLE>
<CAPTION>
                                          OPTIONS OUTSTANDING                           OPTIONS EXERCISABLE
                         -----------------------------------------------------   ----------------------------------
                             NUMBER        WEIGHTED-AVERAGE                          NUMBER
                         OUTSTANDING AT       REMAINING       WEIGHTED-AVERAGE   EXERCISABLE AT    WEIGHTED-AVERAGE
RANGE OF EXERCISE PRICE  OCTOBER 2, 1999   CONTRACTUAL LIFE    EXERCISE PRICE    OCTOBER 2, 1999    EXERCISE PRICE
- -----------------------  ---------------   ----------------   ----------------   ---------------   ----------------
                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                      <C>               <C>                <C>                <C>               <C>
$3.687 - $6.875                429            7.54 Years           $ 6.54              142              $5.89
$7.000 - $8.750                248            7.76 Years             8.27               95               8.50
$9.000 - $10.000                72            7.92 Years             9.60               18               9.77
$10.750 - $12.313              117            9.66 Years            11.70               --                 --
                               ---                                                     ---
$3.687 - $12.313               866                                                     255
                               ===                                                     ===
</TABLE>

     Under the Company's 1992 stock option plan, 417,850 options ranging in
option price from $10.00 to $14.75 per share were repriced to $6.88 per share
during 1998. This repricing was accomplished by canceling the existing options
and issuing new options at new prices with vesting schedules recommencing as of
the date of reprice. The purpose of this transaction was to restore the
incentive effect of such options. In all other respects, the Plan remained
unchanged.

                                      F-12
<PAGE>   57
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE F -- ACCRUED EXPENSES AND OTHER LIABILITIES

     Accrued liabilities consist of:

<TABLE>
<CAPTION>
                                                              SEPTEMBER 26,    OCTOBER 2,
                                                                  1998            1999
                                                              -------------    ----------
                                                                    (IN THOUSANDS)
<S>                                                           <C>              <C>
Accrued salaries and wages and related expenses.............     $3,375          $2,588
Accrued warranty expense....................................        953           1,133
Accrued income taxes........................................         --           1,164
Accrued shareholder litigation settlement cost -- see Note
  L.........................................................      1,400              --
Other accrued expenses......................................      1,996           2,073
                                                                 ------          ------
Total accrued expenses and other liabilities................     $7,724          $6,958
                                                                 ======          ======
</TABLE>

NOTE G -- INDEBTEDNESS

     The Company maintains an unsecured working capital line of credit with its
bank. This line of credit bears interest at the bank's base rate (8.5% at
October 2, 1999 and September 26, 1998). The full amount of the line ($6.0
million) was available to the Company at October 2, 1999. On November 5, 1999,
the Company increased its line of credit to $12.0 million.

     In 1994, the Company purchased land and building, which replaced leased
operating facilities, for $900,000. The land and building are mortgaged under a
$900,000 bank note bearing interest at 8.2%. The carrying value of the land and
building at September 26, 1998 and October 2, 1999 amounted to $948,000 and
$915,000, respectively. The mortgage requires equal monthly principal payments
of $7,500 plus interest over seven years, with a final payment of $270,000 due
in July 2001. The carrying amount of the long-term debt approximates the fair
value. The mortgage contains various covenants including minimum levels of net
worth, working capital and pre-tax earnings. The Company is in compliance with
all covenants of the agreement. As of October 2, 1999 the outstanding balance of
the note amounted to approximately $442,000.

     Also, included in long-term debt is a promissory note (the Note) entered
into in March 1999 by Pinpoint in order to acquire an office building. The Note
bears interest at 7.95% per annum, is due in monthly installments of
approximately $18,000 with final payment due March 2014. As of October 2, 1999
the outstanding balance of the Note amounted to approximately $1,791,000.

     Long-term debt consisted of:

<TABLE>
<CAPTION>
                                                              SEPTEMBER 26,    OCTOBER 2,
                                                                  1998            1999
                                                              -------------    ----------
                                                                    (IN THOUSANDS)
<S>                                                           <C>              <C>
Mortgage note payable.......................................      $533           $2,233
Capital lease obligations...................................        29               --
                                                                  ----           ------
Total long-term debt........................................       562            2,233
Less current portion........................................       116              164
                                                                  ----           ------
                                                                  $446           $2,069
                                                                  ====           ======
</TABLE>

                                      F-13
<PAGE>   58
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

     The schedule of principal payments on long term debt is as follows:

<TABLE>
<S>                                                   <C>
2000................................................  $  164
2001................................................     435
2002................................................      90
2003................................................      98
2004................................................     106
Thereafter..........................................   1,340
                                                      ------
                                                      $2,233
                                                      ======
</TABLE>

NOTE H -- INCOME TAXES

     The provision for income taxes consists of the following:

<TABLE>
<CAPTION>
                                                            1997     1998      1999
                                                            -----    -----    ------
                                                                 (IN THOUSANDS)
<S>                                                         <C>      <C>      <C>
Federal:
Current...................................................  $ 942    $(277)   $1,941
  Deferred................................................   (722)     194       (58)
                                                            -----    -----    ------
                                                              220      (83)    1,883
State:
  Current.................................................    222      107       370
  Deferred................................................   (176)      (6)      (18)
                                                            -----    -----    ------
                                                               46      101       352
Foreign:
  Current.................................................     --       --        37
  Deferred................................................     --       --      (262)
                                                            -----    -----    ------
                                                               --       --      (225)
                                                            -----    -----    ------
                                                            $ 266    $  18    $2,010
                                                            =====    =====    ======
</TABLE>

     The following table shows income before income taxes:

<TABLE>
<CAPTION>
                                                             1997     1998      1999
                                                            ------    -----    ------
                                                                 (IN THOUSANDS)
<S>                                                         <C>       <C>      <C>
Domestic..................................................  $1,137    $ 821    $6,479
Foreign...................................................      16     (130)      970
                                                            ------    -----    ------
                                                            $1,153    $ 691    $7,449
                                                            ======    =====    ======
</TABLE>

                                      F-14
<PAGE>   59
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

     The income taxes recorded differed from the statutory federal income tax
rate due to:

<TABLE>
<CAPTION>
                                                              1997    1998     1999
                                                              ----    ----    ------
                                                                  (IN THOUSANDS)
<S>                                                           <C>     <C>     <C>
Statutory income taxes......................................  $265    $ 21    $2,132
Tax credits, federal and state..............................    --      --       (48)
State income taxes, net of federal benefit..................    31      32       229
Unbenefitted (benefitted) foreign losses....................    13      --      (262)
Permanent differences.......................................   (20)     35        35
Other.......................................................   (23)    (70)      (76)
                                                              ----    ----    ------
                                                              $266    $ 18    $2,010
                                                              ====    ====    ======
</TABLE>

     Deferred income taxes reflect the net tax effects of temporary differences
between the carrying amounts of assets and liabilities for financial reporting
purposes and the amounts used for income tax purposes. The valuation allowance
decreased $262,000 as a result of the utilization of foreign net operating
losses.

     Significant components of the Company's deferred tax assets and liabilities
are as follows:

<TABLE>
<CAPTION>
                                                              SEPTEMBER 26,    OCTOBER 2,
                                                                  1998            1999
                                                              -------------    ----------
                                                                    (IN THOUSANDS)
<S>                                                           <C>              <C>
Deferred tax assets:
Accounts receivable and inventory...........................     $  625          $  999
  Net operating loss carryforwards..........................        365              68
  Product warranty accruals.................................        373             408
  Purchased research and development........................        336             297
  Other liabilities.........................................        379             258
  Valuation allowance for deferred tax assets...............       (262)             --
                                                                 ------          ------
     Total deferred tax assets..............................      1,816           2,030
Deferred tax liabilities:
  Accelerated tax depreciation..............................        731             712
  Prepaid expenses..........................................        248             143
                                                                 ------          ------
     Total deferred tax liabilities.........................        979             855
                                                                 ------          ------
     Net deferred tax asset.................................     $  837          $1,175
                                                                 ======          ======
</TABLE>

     Prior to the merger Pinpoint elected to be taxed under the Subchapter S
provisions of the Internal Revenue Code. Accordingly, Pinpoint's income or loss
is included in the stockholders' individual income tax returns.

                                      F-15
<PAGE>   60
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE I -- LEASES

     The Company leases certain office and manufacturing space under operating
leases. Listed below are the future minimum rental payments required under
operating leases with non-cancelable terms in excess of one year at October 2,
1999.

<TABLE>
<CAPTION>
                                                 (IN THOUSANDS)
<S>                                              <C>
2000...........................................      $  414
2001...........................................         371
2002...........................................         353
2003...........................................         281
                                                     ------
                                                     $1,419
                                                     ======
</TABLE>

     Pinpoint is obligated under a lease agreement for formerly occupied
facilities under a lease, which expires February 1, 2000. The lease provides for
the Company to pay an annual base rent plus expenses, totaling approximately
$43,000, which increases each year as determined by the Consumer Price Index.
Effective March 11, 1999, the Company subleased this space to an unrelated
company on a full-cost pass-through basis, whereby the sublease tenant pays the
landlord directly. The Company remains obligated on the lease payments to the
extent that the sublease tenant defaults on its payments.

     The Company's office leases are subject to adjustments based on actual
floor space occupied. The leases also require payment of real estate taxes and
operating costs. In addition to the office leases, the Company leases
automobiles for business use by a portion of the sales force. Total rental
expense under operating leases for 1997, 1998 and 1999 was approximately
$625,000, $728,000 and $907,000, respectively.

NOTE J -- EMPLOYEE BENEFIT PLAN

     Defined contribution retirement plan -- Zoll has a defined contribution
retirement plan which contains a "401(k)" program for all employees with six
months of service who have attained 21 years of age. The Company may make a
discretionary contribution and an additional discretionary profit sharing
contribution. The Company made a $100,000 contribution to the plan in fiscal
1997, 1998 and 1999.

     401(k) Salary Deferral Plan -- Beginning in 1998, Pinpoint has maintained a
retirement savings plan (the Plan) pursuant to which eligible employees may
defer compensation for income tax purposes under section 401(k) of the Internal
Revenue Code of 1986. Participants in the Plan may contribute up to 15% of their
eligible compensation which are matched by the Company at 50% of the employee
contribution up to 6% of eligible compensation. The Company may make
discretionary matching contributions to the Plan in an amount determined by its
Board of Directors. The Company recorded expense related to the Plan of
approximately $11,000 and $29,000 for the year ended September 26, 1998 and
October 2, 1999, respectively.

NOTE K -- CONCENTRATION OF CREDIT RISK

     The Company sells its products primarily to hospitals, emergency care
providers and universities. The Company performs periodic credit evaluations of
its customers' financial condition and does not require collateral.

     In addition, the Company sells its products to the international market.
Although the Company does not foresee a credit risk associated with these
receivables, repayment is dependent upon the financial stability of the national
economies of the customer to which it sells. In order to hedge the risk of loss
in geographical areas with historical credit risks, in some cases the Company
requires letters of credit from its

                                      F-16
<PAGE>   61
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

foreign customers. Export sales accounted for 22%, 19% and 20% of the Company's
total revenues in 1997, 1998 and 1999, respectively.

     The Company maintains reserves for potential trade receivable credit
losses, and such losses have been within management's expectations.

     Certain materials and components used in the Company's devices and
electrodes are purchased from various single sources. Although the Company
believes that alternative sources of supply for such materials and components
could be developed over a relatively short period of time, the failure to secure
such alternative sources when needed could have a material adverse effect on the
Company's business.

NOTE L -- CONTINGENCIES

     In the course of normal operations, the Company is involved in litigation
arising from commercial disputes and claims from former employees which
management believes will not have a material impact on the Company's financial
position or its results of operations.

     During the quarter ended December 28, 1996, the Company incurred a charge
of approximately $1,300,000 to cover the litigation costs to defend itself in a
shareholder lawsuit initiated in 1994. On July 9, 1998, the Company announced an
agreement in principle concerning the settlement of the lawsuit against it and
certain officers. The settlement, amounting to $1,500,000, was approved by the
court on October 5, 1998. There was no financial impact as a result of the
settlement. Included in accrued expenses at September 26, 1998 is the unpaid
settlement cost and remaining accrued legal fees related to the litigation. A
similar amount due from the insurance company is included in other current
assets at September 26, 1998. In November 1998, the Company received the
insurance reimbursements for the claim and legal costs and paid the remaining
settlement due to the shareholders.

NOTE M -- ACQUISITION

     On November 6, 1996, the Company acquired the assets of the mobile
computing business of Westech Information Systems, Inc. for approximately
$1,500,000 in cash. The acquisition was accounted for as a purchase and the
purchase price was allocated to the assets acquired and liabilities assumed
based on their respective fair values at the date of acquisition. The excess of
the cost over the fair value of net assets acquired is being amortized over
fifteen years. In connection with the acquisition, the Company incurred a
non-recurring charge of $1,000,000 for acquired in-process research and
development which was charged to operations because in management's opinion,
technological feasibility for the acquired research and development had not been
established. The Company's combined results of operations include the operations
of the mobile computing business of Westech Information Systems, Inc. from
November 1996.

     The following unaudited pro forma information for fiscal year 1997 shows
the results of operations as if the transaction occurred at the beginning the
year of acquisition (in thousands, except per share amounts):

<TABLE>
<S>                                                           <C>
Net sales...................................................  $57,935
Net income..................................................      876
Basic earnings per common share.............................  $  0.13
Diluted earnings per common and equivalent share............  $  0.13
</TABLE>

     The pro forma results of operations are not necessarily indicative of the
actual results of operations that would have occurred had the purchase actually
been made at the beginning of the respective periods and is not necessarily
indicative of results that may be obtained in the future.

                                      F-17
<PAGE>   62
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

NOTE N -- SEGMENT AND GEOGRAPHIC INFORMATION

     Segment information:  The Company reports revenue information to the chief
operating decision maker for four operating segments, determined on the type of
customer or product. These segments include the sale of cardiac resuscitation
devices and accessories and data collection management software to the hospital
market and to the prehospital market in North America, the sale of
disposable/other products and the sale of cardiac resuscitation devices and
accessories and disposable electrodes to the international market. Each of these
segments has similar characteristics, manufacturing processes, distribution and
marketing strategies, as well as a similar regulatory environment.

     In order to make operating and strategic decisions, the Company's chief
operating decision maker evaluates revenue performance based on the worldwide
revenues of each segment and, due to shared infrastructures, profitability based
on an enterprise-wide basis. Net sales by segment were as follow:

<TABLE>
<CAPTION>
                                                         1997       1998       1999
                                                        -------    -------    -------
                                                               (IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
Hospital Market -- North America devices..............  $21,562    $19,962    $30,868
Pre-hospital Market -- North America devices..........   12,721     14,914     19,115
Other -- North America................................   11,855     12,841     15,035
International Market -- excluding North America.......   11,695      9,803     13,664
                                                        -------    -------    -------
                                                        $57,833    $57,520    $78,682
                                                        =======    =======    =======
</TABLE>

     The Company reports assets on a combined basis to the chief operating
decision maker.

     Geographic information:  Net sales by major geographical area, determined
on the basis of destination of the goods, are as follow:

<TABLE>
<CAPTION>
                                                         1997       1998       1999
                                                        -------    -------    -------
                                                               (IN THOUSANDS)
<S>                                                     <C>        <C>        <C>
United States.........................................  $45,523    $46,952    $63,838
Foreign...............................................   12,310     10,568     14,844
                                                        -------    -------    -------
                                                        $57,833    $57,520    $78,682
                                                        =======    =======    =======
</TABLE>

     In each of the years in the three year period ended October 2, 1999, no
single customer represented over 10% of the Company's combined net sales.

NOTE O -- QUARTERLY FINANCIAL DATA (UNAUDITED)

     Summarized quarterly financial data for 1998 and 1999 is as follows:

<TABLE>
<CAPTION>
                                                                   QUARTER ENDED
                                               ------------------------------------------------------
                                               DECEMBER 27,    MARCH 29,    JUNE 28,    SEPTEMBER 27,
                                                   1997          1998         1998          1998
                                               ------------    ---------    --------    -------------
                                                       (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                            <C>             <C>          <C>         <C>
1998
Net sales....................................    $13,019        $14,354     $13,326        $16,821
Gross profit.................................      7,447          8,450       7,706          9,649
Income (loss) from operations................        273            734      (1,148)           419
Net income (loss)............................        305            743        (730)           355
Basic earnings (loss) per common share.......    $  0.05        $  0.12     $ (0.12)       $  0.06
Diluted earnings (loss) per common and
  equivalent share...........................    $  0.05        $  0.11     $ (0.11)       $  0.05
</TABLE>

                                      F-18
<PAGE>   63
                            ZOLL MEDICAL CORPORATION

       NOTES TO SUPPLEMENTAL COMBINED FINANCIAL STATEMENTS -- (CONTINUED)

<TABLE>
<CAPTION>
                                                                     QUARTER ENDED
                                                    -----------------------------------------------
                                                    JANUARY 2,    APRIL 3,    JULY 3,    OCTOBER 2,
                                                       1999         1999       1999         1999
                                                    ----------    --------    -------    ----------
                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                 <C>           <C>         <C>        <C>
1999
Net sales.........................................   $16,056      $17,941     $20,813     $23,872
Gross profit......................................     9,524       10,502      12,314      13,856
Income from operations............................       876        1,283       2,073       3,262
Net income........................................       702          936       1,534       2,267
Basic earnings per common share...................      0.11         0.14        0.22        0.35
Diluted earnings per common and equivalent
  share...........................................      0.11         0.14        0.22        0.32
</TABLE>

                                      F-19
<PAGE>   64

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                1,400,000 SHARES

                            ZOLL MEDICAL CORPORATION
                                  COMMON STOCK

                       ---------------------------------
                                   PROSPECTUS

                                JANUARY   , 2000
                       ---------------------------------

                              SALOMON SMITH BARNEY
                           U.S. BANCORP PIPER JAFFRAY
                          ADAMS, HARKNESS & HILL, INC.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   65

                PART II. INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

     The following table sets forth expenses payable by us in connection with
the issuance and distribution of the securities being registered (all amounts
except the registration fee are estimated):

<TABLE>
<S>                                                           <C>
Registration fee -- Securities and Exchange Commission......  $ 15,966
Accountants' fees and expenses..............................
Blue Sky fees and expenses..................................
Legal fees and expenses (other than Blue Sky)...............
Printing expenses...........................................
Nasdaq Listing Fee..........................................
Miscellaneous...............................................
                                                              --------
          TOTAL.............................................  $700,000
                                                              ========
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     Our restated articles of organization provide that a director shall not
have personal liability to us or our shareholders for monetary damages arising
out of the director's breach of fiduciary duty as a director, provided, however,
that such provision does not eliminate or limit the liability of a director (i)
for any breach of the director's duty of loyalty to the corporation or its
shareholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or knowing violation of law, (iii) under Sections 61 or
62 of the Massachusetts Business Corporation Law dealing with liability for
unauthorized distributions and loans to insiders, respectively, or (iv) for any
transaction from which the director derived an improper personal benefit. No
amendment or repeal of our articles of organization shall adversely effect these
provisions for acts occurring prior to such amendment.

     Our amended and restated by-laws further provide that we shall, except as
limited by law, indemnify each person who is or was a director or officer of our
company or who is or was a director or officer of our company and is serving, or
shall have served, at our request, as director, officer, employee, trustee,
partner or other agent of another organization or in any capacity with respect
to any employee benefit plan of our company, against all expenses actually and
reasonably incurred (including attorneys' fees and disbursements), judgments,
awards, fines and penalties and reasonable amounts paid in settlement of a
proceeding incurred by him or on his behalf in connection with, or arising out
of, the defense or disposition of any threatened, pending or completed action,
suit or other proceeding, whether civil, criminal, administrative or
investigative, in which he may be involved by reason of being or having been
such a director or officer or as a result of service with respect to any such
employee benefit plan. We shall not indemnify any director or officer who did
not act in the good faith and reasonable belief that his actions were in the
best interests of the company or, with respect to a criminal matter, that he did
not have reasonable cause to believe that his conduct was lawful. Additionally,
our by-laws provide that no indemnification shall be provided to a director or
officer with respect to any proceeding by or in the right of the company or if
it is determined that such party received an improper personal benefit, provided
that expenses incurred in successfully defending an allegation of improper
personal benefit may be paid by the company if approved by the Board of
Directors. Section 67 of Chapter 156B of the Massachusetts General Laws
authorizes a corporation to indemnify its directors, officers, employees and
other agents unless such person shall have been adjudicated in any proceeding
not to have acted in good faith in the reasonable belief that such action was in
the best interests of the corporation or, to the extent such matter is related
to service with respect to an employee benefit plan, in the best interests of
the participants or beneficiaries of such employee benefit plan.

     The effect of these provisions would be to permit indemnification by us
for, among other liabilities, liabilities arising out of the Securities Act of
1933, as amended.

                                      II-1
<PAGE>   66

     Section 67 of the Massachusetts Business Corporation Law also affords a
Massachusetts corporation the power to obtain insurance on behalf of its
directors and officers against liabilities incurred by them in those capacities.
We have procured a directors' and officers' liability and company reimbursement
liability insurance policy that (i) insures our directors and officers against
losses (above a deductible amount) arising from certain claims made against them
by reason of certain acts done or attempted by such directors or officers and
(ii) insures us against losses (above a deductible amount) arising from any such
claims, but only if we are required or permitted to indemnify such directors or
officers for such losses under statutory or common law or under provisions of
our amended and restated articles of organization or amended and restated
by-laws.

ITEM 16.  EXHIBITS.

<TABLE>
<C>    <S>
1.1*   Form of underwriting agreement.
 4.1   Shareholders Rights Plan.(1)
 4.2   Specimen Certificate for Shares of Common Stock, $.02 per
       value per share, for Zoll Medical Corporation.(2)
 4.3   Restated Articles of Organization.(2)
 4.4   Amended and Restated By-laws.(2)
5.1*   Opinion of Goodwin, Procter & Hoar LLP as to the validity of
       the shares of common stock being offered.
21.1   Subsidiaries of Zoll Medical Corporation.
23.1*  Consent of Goodwin, Procter & Hoar LLP (included in Exhibit
       5.1 hereto).
23.2   Consent of Ernst & Young LLP.
24.1   Powers of Attorney (included on signature page hereof).
</TABLE>

- ---------------
 *  To be filed by amendment.

(1) Incorporated by reference to Zoll Medical Corporation's Form 8-K filed with
    the Securities and Exchange Commission on June 11, 1998.

(2) Incorporated by reference to Zoll Medical Corporation's Registration
    Statement on Form S-1, as amended, filed with the Securities and Exchange
    Commission on May 15, 1992 (Registration Statement No. 33-47937).

ITEM 17.  UNDERTAKINGS.

     (a) Zoll Medical Corporation hereby undertakes:

          (1) To file, during any period in which offers or sales are being made
     pursuant to this registration statement, a post-effective amendment to this
     registration statement:

             (i) To include 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 the registration statement (or the 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 low or high end of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the Commission pursuant to Rule 424(b) if, in the aggregate, the
        changes in volume and price represent no more than a 20 percent change
        in the maximum aggregate offering price set forth in the "Calculation of
        Registration Fee" table in the effective registration statement;

             (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.
                                      II-2
<PAGE>   67

    provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
    the information required to be included in a post-effective amendment by
    those paragraphs is contained in periodic reports filed with or furnished to
    the Securities and Exchange Commission by Zoll Medical Corporation pursuant
    to Section 13 or 15(d) of the Securities Exchange Act of 1934 that are
    incorporated by reference in this registration statement;

          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each post-effective amendment that contains a form
     of prospectus 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.

          (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) Zoll Medical Corporation hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of Zoll
Medical Corporation's annual report pursuant to Section 13(a) or Section 15(d)
of the Securities Exchange Act of 1934 that is incorporated by reference in this
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
Zoll Medical Corporation pursuant to the foregoing provisions, or otherwise,
Zoll Medical Corporation has been informed that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the
event that a claim for indemnification against such liabilities (other than the
payment by Zoll Medical Corporation of expenses incurred or paid by a director,
officer or controlling person of Zoll Medical Corporation 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, Zoll
Medical Corporation 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 Securities Act of 1933 and will be governed by the
final adjudication of such issue.

     (d) Zoll Medical Corporation hereby undertakes that:

          (1) For purposes of determining any liability under the Act, the
     information omitted from the form of prospectus filed as part of this
     Registration Statement in reliance upon Rule 430A and contained in a form
     of prospectus filed by Zoll Medical Corporation pursuant to Rule 424(b)(1)
     or (4) or 497(h) under the Act shall be deemed to be part of this
     Registration Statement as of the time it was declared effective.

          (2) For the purpose of determining any liability under the Act, each
     post-effective amendment that contains a form of prospectus 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-3
<PAGE>   68

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Burlington, The Commonwealth of Massachusetts on
January 14, 2000.

                                          ZOLL MEDICAL CORPORATION

                                          By:     /s/ RICHARD A. PACKER
                                            ------------------------------------
                                              Richard A. Packer
                                              Chief Executive Officer and
                                              President

                               POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, that we, the undersigned officers and
directors of Zoll Medical Corporation hereby severally constitute Richard A.
Packer and A. Ernest Whiton, and each of them singly, our true and lawful
attorneys with full power to them, and each of them singly, to sign for us and
in our names in the capacities indicated below any and all amendments (including
post-effective amendments) to this registration statement (or to any other
registration statement for the same offering that is to be effective upon filing
pursuant to Rule 462(b) under the Securities Act), and generally to do all such
things in our names and in our capacities as officers and directors to enable
Zoll Medical Corporation to comply with the provisions of the Securities Act of
1933 and all requirements of the Securities and Exchange Commission, hereby
ratifying and confirming our signatures as they may be signed by our said
attorneys, or any of them, to said registration statement and any and all
amendments thereto.

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed below by the following persons in the
capacities and on the date indicated.

<TABLE>
<CAPTION>
SIGNATURE                                                       CAPACITY                     DATE
- ---------                                                       --------                     ----
<S>                                                  <C>                               <C>
               /s/ RICHARD A. PACKER                 Chief Executive Officer,          January 14, 2000
- ---------------------------------------------------  President and Director
                 Richard A. Packer                   (Principal Executive Officer)

               /s/ A. ERNEST WHITON                  Chief Financial Officer           January 14, 2000
- ---------------------------------------------------  (Principal Financial and
                 A. Ernest Whiton                    Accounting Officer)

               /s/ WILLARD M. BRIGHT                 Director                          January 14, 2000
- ---------------------------------------------------
                 Willard M. Bright

             /s/ THOMAS M. CLAFLIN, II               Director                          January 14, 2000
- ---------------------------------------------------
               Thomas M. Claflin, II

                /s/ JAMES W. BIONDI                  Director                          January 14, 2000
- ---------------------------------------------------
                  James W. Biondi

              /s/ M. STEPHEN HEILMAN                 Director                          January 14, 2000
- ---------------------------------------------------
                M. Stephen Heilman

               /s/ DANIEL M. MULVENA                 Director                          January 14, 2000
- ---------------------------------------------------
                 Daniel M. Mulvena
</TABLE>

                                      II-4
<PAGE>   69

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
  NO.                             DESCRIPTION
- -------                           -----------
<C>       <S>
  1.1*    Form of Underwriting Agreement.
  4.1     Shareholders Rights Plan.(1)
  4.2     Specimen Certificate for Shares of Common Stock, $.02 per
          value per share, for Zoll Medical Corporation.(2)
  4.3     Restated Articles of Organization.(2)
  4.4     Amended and Restated By-laws.(2)
  5.1*    Opinion of Goodwin, Procter & Hoar LLP as to the validity of
          the shares of common stock being offered.
 21.1     Subsidiaries of Zoll Medical Corporation.
 23.1*    Consent of Goodwin, Procter & Hoar LLP (included in Exhibit
          5.1 hereto).
 23.2     Consent of Ernst & Young LLP.
 24.1     Powers of Attorney (included on signature page hereof).
</TABLE>

- ---------------
 *  To be filed by amendment.

(1) Incorporated by reference to Zoll Medical Corporation's Form 8-K filed with
    the Securities and Exchange Commission on June 11, 1998.

(2) Incorporated by reference to Zoll Medical Corporation's Registration
    Statement on Form S-1, as amended, filed with the Securities and Exchange
    Commission on May, 15, 1992 (Registration Statement No. 33-47937).

<PAGE>   1
                                                                    EXHIBIT 21.1

                              List of Subsidiaries

Bio-Detek, Incorporated, incorporated in Massachusetts
ZMI France, S.A.R.L., incorporated in France
ZMD Corporation, incorporated in Delaware
ZOLL International, Inc., incorporated in U.S. Virgin Islands
ZOLL Medical (U.K.) Ltd, incorporated in United Kingdom
Westech Mobile Solutions, Inc., incorporated in Vancouver, B.C. Canada
ZOLL Medical Deutchland (GmbH), incorporated in Germany
Pinpoint Technologies, Inc.

<PAGE>   1
                                                                    Exhibit 23.2

                        Consent of Independent Auditors

We consent to the reference to our firm under the caption "Experts" and to the
use of our report dated November 12, 1999 with respect to the supplemental
combined financial statements of ZOLL Medical Corporation included in the
Registration Statement (Form S-3) and related Prospectus of ZOLL Medical
Corporation for the registration of 1,610,000 shares of its common stock.

We also consent to the incorporation by reference  herein of our report dated
November 12, 1999, with respect to the consolidated financial statements of ZOLL
Medical Corporation incorporated by reference in its Annual Report on Form 10-K
for the year ended October 2, 1999, and the related financial statement schedule
included therein, filed with the Securities and Exchange Commission.

                                                           /s/ Ernst & Young LLP

Boston, Massachusetts
January 12, 2000


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