KNOWLES MANUFACTURING LTD
S-4/A, EX-99.1, 2000-08-17
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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<PAGE>   1

                                                                    EXHIBIT 99.1

                             LETTER OF TRANSMITTAL

                       KNOWLES ELECTRONICS HOLDINGS, INC.

                             OFFER TO EXCHANGE ITS
                  13 1/8% SENIOR SUBORDINATED NOTES DUE 2009,
    WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
                          FOR ANY AND ALL OUTSTANDING
                   13 1/8% SENIOR SUBORDINATED NOTES DUE 2009

          Pursuant to the Prospectus dated [                  ], 2000.

THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
[               ], 2000 UNLESS EXTENDED. TENDERS MAY BE WITHDRAWN PRIOR TO 5:00
P.M., NEW YORK CITY TIME, ON [               ], 2000 UNLESS PREVIOUSLY ACCEPTED.

               DELIVERY TO: THE BANK OF NEW YORK, EXCHANGE AGENT

<TABLE>
<S>                                                 <C>
                     BY MAIL:                                  BY COURIER OR HAND DELIVERY:
               The Bank of New York                                The Bank of New York
                101 Barclay Street                                  101 Barclay Street
             Reorganization Section 7E                        Corporate Trust Services Window
             New York, New York 10286                                  Ground Level
                                                                 New York, New York 10286
</TABLE>

                             FOR INFORMATION CALL:

                                 [            ]

DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE WILL NOT
CONSTITUTE A VALID DELIVERY.

     The undersigned acknowledges receipt of the Prospectus dated
[               ], 2000 (the "Prospectus") of Knowles Electronics Holdings,
Inc., a Delaware Corporation (the "Issuer"), and this Letter of Transmittal
(this "Letter"). The Prospectus and this Letter together constitute the offer
(the "Exchange Offer") to exchange an aggregate principal amount of up to
$153,200,000 of the Issuer's 13 1/8% Senior Subordinated Notes due 2009, which
have been registered under the Securities Act of 1933, as amended (the "New
Notes"), for an equal principal amount of the Issuer's outstanding 13 1/8%
Senior Subordinated Notes due 2009 (the "Old Notes"). The Bank of New York is
the exchange agent (the "Exchange Agent") for the Exchange Offer.

     For each Old Note accepted for exchange, the holder of such Old Note will
receive a New Note having a principal amount at maturity equal to that of the
surrendered Old Note. The New Notes will accrue interest at 13 1/8% per annum
from the last date on which interest was paid on the Old Notes surrendered in
exchange therefor. Interest on the New Notes is payable on April 15 and October
15 of each year commencing on October 15, 2000, subject to the Indenture dated
as of October 1, 1999 among the Issuer, certain of its subsidiaries (the
"Guarantors") and The Bank of New York, as Trustee. Capitalized terms used
herein but not defined herein have the meaning set forth in the Registration
Rights Agreement (the "Registration Rights Agreement") dated as of October 1,
1999 among the Issuer and the initial purchasers of the Old Notes.
<PAGE>   2

     The Registration Rights Agreement requires that if:

          (1) because of any change in law or applicable interpretations thereof
     by the staff of the SEC, the Issuer is not permitted to effect the Exchange
     Offer,

          (2) the Exchange Offer is not for any other reason consummated by
     April 28, 2000; or

          (3) the Exchange Offer has been completed and in the opinion of
     counsel for the placement agents a Registration Statement must be filed and
     a prospectus must be delivered by the placement agents in connection with
     any offering and sale of Old Notes,

then the Issuer will file with the SEC as promptly as practical following the
occurrence of any of the foregoing events listed under (1) through (3) a shelf
registration statement (the "Shelf Registration Statement") to cover resales of
Transfer Restricted Securities (as defined below) by such holders who satisfy
certain conditions relating to the provision of information in connection with
the Shelf Registration Statement. For purposes of the foregoing, "Transfer
Restricted Securities" means each Old Note until

     - the date on which such Old Note has been disposed of pursuant to the
       Shelf Registration Statement,

     - the date on which such Old Note has ceased to be outstanding or

     - the date on which such Old Note is eligible to be sold to the public
       pursuant to Rule 144(k) under the Securities Act.

     Because the Exchange Offer had not yet been consummated and the Shelf
Registration Statement had not been declared effective, on April 28, 2000 the
interest rate on the initial notes increased by 0.5% per annum until the
exchange offer is consummated or the Shelf Registration Statement is declared
effective.

     The exchange offer being made in the Prospectus will satisfy the
requirements of the Registration Rights Agreement such that the Issuer will no
longer be required to pay additional interest from the date the exchange offer
is consummated.

     The Issuer and the Guarantors reserve their rights to delay acceptance of
any Old Notes, extend the Exchange Offer or terminate the Exchange Offer and not
permit acceptance of Old Notes not previously accepted if any of the conditions
set forth in "The Exchange Offer -- Conditions" section of the Prospectus shall
have occurred and shall not have been waived by the Issuer and the Guarantors,
by giving written notice of such delay, extension or termination to the Exchange
Agent, and to amend the terms of the Exchange Offer in any manner they deem to
be advantageous to the holders of the Old Notes.

     Any such delay in acceptance, extension, termination or amendment will be
followed as promptly as practicable by written notice thereof to the Exchange
Agent. If the Exchange Offer is amended in a manner determined by the Issuer to
constitute a material change, the Issuer will promptly disclose such amendment
in a manner reasonably calculated to inform the holders of the Old Notes of such
amendment.

     This Letter is to be completed by a holder of Old Notes if Old Notes are to
be forwarded herewith or if a tender of Old Notes, if available, is to be made
by book-entry transfer to the account maintained by the Exchange Agent at The
Depository Trust Company ("DTC") pursuant to the procedures set forth in "The
Exchange Offer" section of the Prospectus. Holders of Old Notes whose
certificates are not immediately available, or who are unable to deliver their
certificates or confirmation of the book-entry tender of their Old Notes into
the Exchange Agent's account at DTC and all other documents required by this
Letter to the Exchange Agent on or prior to the expiration of the Exchange
Offer, must tender their Old Notes according to the guaranteed delivery
procedures set forth in "The Exchange Offer -- Guaranteed Delivery Procedures"
section of the Prospectus. See Instruction 1 of this Letter. Delivery of
documents to DTC does not constitute delivery to the Exchange Agent.

     The undersigned has completed the appropriate boxes below and signed this
Letter to indicate the action the undersigned desires to take with respect to
the Exchange Offer.

                                        2
<PAGE>   3

     List below the Old Notes to which this Letter relates. If the space
provided below is inadequate, the certificate numbers and principal amount of
Old Notes should be listed on a separate signed schedule affixed hereto.

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------
                 DESCRIPTION OF OLD NOTES                           1                   2                   3
----------------------------------------------------------------------------------------------------------------------
                                                                                    Aggregate
                                                                                    Principal           Principal
     Name(s) and Address(es) of Registered Holder(s)           Certificate          Amount of            Amount
                (Please fill in, if blank)                     Number(s)*          Old Note(s)         Tendered**
----------------------------------------------------------------------------------------------------------------------
<S>                                                        <C>                 <C>                 <C>

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

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

                                                             ------------------------------------------------------
                                                                  TOTAL
----------------------------------------------------------------------------------------------------------------------
  * Need not be completed if Old Notes are being tendered by book-entry transfer.
 ** Unless otherwise indicated in this column, a holder will be deemed to have tendered ALL of the Old Notes
    represented by the Old Notes indicated in column 2. See Instruction 2. Old Notes tendered hereby must be in
    denominations of principal amount of $1,000 and any integral multiple thereof. See Instruction 1.
----------------------------------------------------------------------------------------------------------------------
</TABLE>

[ ]  CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
     MADE TO THE ACCOUNT MAINTAINED BY THE EXCHANGE AGENT WITH THE BOOK-ENTRY
     TRANSFER FACILITY AND COMPLETE THE FOLLOWING:

    Name of Tendering Institution

    Account Number                                       Transaction Code Number

[ ]  CHECK HERE IF TENDERED OLD NOTES ARE BEING DELIVERED PURSUANT TO A NOTICE
     OF GUARANTEED DELIVERY PREVIOUSLY SENT TO THE EXCHANGE AGENT AND COMPLETE
     THE FOLLOWING:

    Name(s) of Registered Holder(s)

    Window Ticket Number (if any)

    Date of Execution of Notice of Guaranteed Delivery

    Name of Institution Which Guaranteed Delivery

    IF DELIVERED BY BOOK-ENTRY TRANSFER, COMPLETE THE FOLLOWING:

    Account Number                                       Transaction Code Number

[ ]  CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
     COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS
     THERETO.

    Name:

    Address:

                                        3
<PAGE>   4

              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY

Ladies and Gentlemen:

     Upon the terms and subject to the conditions of the Exchange Offer, the
undersigned hereby tenders to the Issuer the aggregate principal amount of Old
Notes indicated above. Subject to, and effective upon, the acceptance for
exchange of the Old Notes tendered hereby, the undersigned hereby sells, assigns
and transfers to, or upon the order of, the Issuer all right, title and interest
in and to such Old Notes as are being tendered hereby.

     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the Old Notes
tendered hereby and that the Issuer will acquire good and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances and
not subject to any adverse claim when the same are accepted by the Issuer. The
undersigned hereby further represents that any New Notes acquired in exchange
for Old Notes tendered hereby will have been acquired in the ordinary course of
business of the person receiving such New Notes, whether or not such person is
the undersigned, that neither the holder of such Old Notes nor any such other
person is engaged in, or intends to engage in, a distribution of such New Notes,
or has an arrangement or understanding with any person to participate in the
distribution of such New Notes, and that neither the holder of such Old Notes
nor any such other person is an "affiliate," as defined in Rule 405 under the
Securities Act of 1933, as amended (the "Securities Act"), of the Issuer.

     The undersigned also acknowledges that this Exchange Offer is being made
based upon the Issuer's and the Guarantors' understanding of an interpretation
by the staff of the Securities and Exchange Commission (the "Commission") as set
forth in no-action letters issued to third parties, including Exxon Capital
Holdings Corporation, SEC No-Action Letter (available May 13, 1988), Morgan
Stanley & Co. Incorporated, SEC No-Action Letter (available June 5, 1991) and
Shearman & Sterling, SEC No-Action Letter (available July 2, 1993), that the New
Notes issued in exchange for the Old Notes pursuant to the Exchange Offer may be
offered for resale, resold and otherwise transferred by each holder thereof
(other than a broker-dealer who acquires such New Notes directly from the Issuer
for resale pursuant to Rule 144A under the Securities Act or any other available
exemption under the Securities Act or any such holder that is an "affiliate" of
the Issuer within the meaning of Rule 405 under the Securities Act), without
compliance with the registration and prospectus delivery provisions of the
Securities Act, provided that such New Notes are acquired in the ordinary course
of such holder's business and such holder is not engaged in, and does not intend
to engage in, a distribution of such New Notes and has no arrangement with any
person to participate in the distribution of such New Notes. If a holder of Old
Notes is engaged in or intends to engage in a distribution of the New Notes or
has any arrangement or understanding with respect to the distribution of the New
Notes to be acquired pursuant to the Exchange Offer, such holder may not rely on
the applicable interpretations of the staff of the Commission and must comply
with the registration and prospectus delivery requirements of the Securities Act
in connection with any secondary resale transaction. If the undersigned is a
broker-dealer that will receive New Notes for its own account in exchange for
Old Notes that were acquired by it as a result of market-making activities or
other trading activities, it acknowledges that it will deliver a prospectus in
connection with any resale of such New Notes; however, by so acknowledging and
by delivering a prospectus, the undersigned will not be deemed to admit that it
is an "underwriter" within the meaning of the Securities Act.

     The undersigned will, upon request, execute and deliver any additional
documents deemed by the Issuer to be necessary or desirable to complete the
sale, assignment and transfer of the Old Notes tendered hereby. All authority
conferred or agreed to be conferred in this Letter and every obligation of the
undersigned hereunder shall be binding upon the successors, assigns, heirs,
executors, administrators, trustees in bankruptcy and legal representatives of
the undersigned and shall not be affected by, and shall survive, the death or
incapacity of the undersigned. This tender may be withdrawn only in accordance
with the procedures set forth in "The Exchange Offer -- Withdrawal of Tenders"
section of the Prospectus.

     Unless otherwise indicated herein in the box entitled "Special Issuance
Instructions" below, please deliver the New Notes (and, if applicable,
substitute certificates representing Old Notes for any Old Notes not exchanged)
in the name of the undersigned or, in the case of a book-entry delivery of Old
Notes, please credit the account indicated above maintained at DTC. Similarly,
unless otherwise indicated under the box entitled "Special Delivery
Instructions" below,

                                        4
<PAGE>   5

please send the New Notes (and, if applicable, substitute certificates
representing Old Notes for any Old Notes not exchanged) to the undersigned at
the address shown above in the box entitled "Description of Old Notes."

     THE UNDERSIGNED, BY COMPLETING THE BOX ENTITLED "DESCRIPTION OF OLD NOTES"
ABOVE AND SIGNING THIS LETTER, WILL BE DEEMED TO HAVE TENDERED THE OLD NOTES AS
SET FORTH IN SUCH BOX ABOVE.

                                        5
<PAGE>   6

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

                         SPECIAL ISSUANCE INSTRUCTIONS
                           (SEE INSTRUCTIONS 3 AND 4)

        To be completed ONLY if certificates for Old Notes not exchanged
   and/or New Notes are to be issued in the name of and sent to someone other
   than the person(s) whose signature(s) appear(s) on this Letter above, or
   if Old Notes delivered by book-entry transfer which are not accepted for
   exchange are to be returned by credit to an account maintained at DTC
   other than the account indicated above.

   Issue New Notes and/or Old Notes to:

   Name(s):
   ------------------------------------------------
                             (PLEASE TYPE OR PRINT)

          ------------------------------------------------------------
                             (PLEASE TYPE OR PRINT)

   Address:
   --------------------------------------------------

          ------------------------------------------------------------
                              (INCLUDING ZIP CODE)

   (Complete accompanying Substitute Form W-9)

   Credit unexchanged Old Notes delivered by book-entry transfer to DTC
   account set forth below:

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

                         SPECIAL DELIVERY INSTRUCTIONS
                           (SEE INSTRUCTIONS 3 AND 4)

        To be completed ONLY if certificates for Old Notes not exchanged
   and/or New Notes are to be sent to someone other than the person(s) whose
   signature(s) appear(s) on this Letter above or to such person(s) at an
   address other than shown in the box entitled "Description of Old Notes" on
   this Letter above.

   Mail New Notes and/or Old Notes to:

   Name(s):
   ------------------------------------------------
                             (PLEASE TYPE OR PRINT)

          ------------------------------------------------------------
                             (PLEASE TYPE OR PRINT)

   Address:
   --------------------------------------------------

          ------------------------------------------------------------
                              (INCLUDING ZIP CODE)

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

IMPORTANT: THIS LETTER (TOGETHER WITH THE CERTIFICATES FOR OLD NOTES OR A BOOK-
ENTRY CONFIRMATION AND ALL OTHER REQUIRED DOCUMENTS OR THE NOTICE OF GUARANTEED
DELIVERY) MUST BE RECEIVED BY THE EXCHANGE AGENT PRIOR TO 5:00 P.M., NEW YORK
CITY TIME, ON THE EXPIRATION DATE.

                     PLEASE READ THIS LETTER OF TRANSMITTAL
                   CAREFULLY BEFORE COMPLETING ANY BOX ABOVE.

                                        6
<PAGE>   7

                                PLEASE SIGN HERE
                   (TO BE COMPLETED BY ALL TENDERING HOLDERS)
                  (Complete accompanying Substitute Form W-9)

Dated:
--------------------------------------------------------------------------------

-------------------------------------------------------------------------------X

-------------------------------------------------------------------------------X
                            (SIGNATURE(S) OF OWNER)

     Area Code and Telephone Number:
----------------------------------------------------------------------------

     If a holder is tendering any Old Notes, this Letter must be signed by the
registered holder(s) as the name(s) appear(s) on the certificate(s) for the Old
Notes or by any person(s) authorized to become registered holder(s) by
endorsements and documents transmitted herewith. If signature is by a trustee,
executor, administrator, guardian, officer or other person acting in a fiduciary
or representative capacity, please set forth full title. See Instruction 3.

Name(s):
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
                             (PLEASE TYPE OR PRINT)
Capacity:
--------------------------------------------------------------------------------

Address:
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
                              (INCLUDING ZIP CODE)

                              SIGNATURE GUARANTEE
                         (IF REQUIRED BY INSTRUCTION 3)

Signature(s) Guaranteed by
an Eligible Institution:
--------------------------------------------------------------------------------
                             (AUTHORIZED SIGNATURE)

--------------------------------------------------------------------------------
                                    (TITLE)

--------------------------------------------------------------------------------
                                (NAME AND FIRM)

Dated:
--------------------------------------------------------------------------------

                                        7
<PAGE>   8

                                  INSTRUCTIONS

                       KNOWLES ELECTRONICS HOLDINGS, INC.

     FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER TO EXCHANGE ITS
                  13 1/8% SENIOR SUBORDINATED NOTES DUE 2009,
    WHICH HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,
                          FOR ANY AND ALL OUTSTANDING
                   13 1/8% SENIOR SUBORDINATED NOTES DUE 2009

1. DELIVERY OF THIS LETTER AND OLD NOTES; GUARANTEED DELIVERY PROCEDURES.

     This Letter is to be completed by holders of Old Notes either if
certificates are to be forwarded herewith or if tenders are to be made pursuant
to the procedures for delivery by book-entry transfer set forth in "The Exchange
Offer -- Book-Entry Transfer" section of the Prospectus. Certificates for all
physically tendered Old Notes, or a confirmation of book-entry transfer from DTC
("Book-Entry Confirmation"), as the case may be, as well as a properly completed
and duly executed Letter of Transmittal and any other documents required by this
Letter, must be received by the Exchange Agent at the address set forth herein
on or prior to the Expiration Date, or the tendering holder must comply with the
guaranteed delivery procedures set forth below. Old Notes tendered hereby must
be in denominations of principal amount at maturity of $1,000 and any integral
multiple thereof.

     Holders of Old Notes whose certificates for Old Notes are not immediately
available or who cannot deliver their certificates and all other required
documents to the Exchange Agent on or prior to the Expiration Date, or who
cannot complete the procedure for book-entry transfer on a timely basis, may
tender their Old Notes pursuant to the guaranteed delivery procedures set forth
in "The Exchange Offer -- Guaranteed Delivery Procedures" section of the
Prospectus. Pursuant to such procedures, (i) such tender must be made through an
Eligible Institution (as defined below), (ii) prior to the Expiration Date, the
Exchange Agent must receive from such Eligible Institution a properly completed
and duly executed Letter of Transmittal and Notice of Guaranteed Delivery,
substantially in the form provided by the Issuer (by mail or hand delivery),
setting forth the name and address of the holder of Old Notes and the amount of
Old Notes tendered, stating that the tender is being made thereby and
guaranteeing that within three New York Stock Exchange ("NYSE") trading days
after the date of execution of the Notice of Guaranteed Delivery, the
certificates for all physically tendered Old Notes, or a Book-Entry
Confirmation, as the case may be, and any other documents required by this
Letter will be deposited by the Eligible Institution with the Exchange Agent,
and (iii) the certificates for all physically tendered Old Notes, in proper form
for transfer, or Book-Entry Confirmation, as the case may be, and all other
documents required by this Letter, are received by the Exchange Agent within
three NYSE trading days after the date of execution of the Notice of Guaranteed
Delivery.

     The method of delivery of this Letter, the Old Notes and all other required
documents is at the election and risk of the tendering holders, but the delivery
will be deemed made only when actually received or confirmed by the Exchange
Agent. If Old Notes are sent by mail, it is suggested that the mailing be made
sufficiently in advance of the Expiration Date to permit delivery to the
Exchange Agent prior to 5:00 p.m., New York City time, on the Expiration Date.

     See "The Exchange Offer" section of the Prospectus.

2. PARTIAL TENDERS (NOT APPLICABLE TO HOLDERS OF OLD NOTES WHO TENDER BY
   BOOK-ENTRY TRANSFER).

     If less than all of the Old Notes evidenced by a submitted certificate are
to be tendered, the tendering holder(s) should fill in the aggregate principal
amount of Old Notes to be tendered in the box above entitled "Description of Old
Notes-Principal Amount Tendered." A reissued certificate representing the
balance of nontendered Old Notes will be sent to such tendering holder, unless
otherwise provided in the appropriate box on this Letter, promptly after the
Expiration Date. All of the Old Notes delivered to the Exchange Agent will be
deemed to have been tendered unless otherwise indicated.

                                        8
<PAGE>   9

3. SIGNATURES OF THIS LETTER; BOND POWERS AND ENDORSEMENTS; GUARANTEE OF
   SIGNATURES.

     If this Letter is signed by the registered holder of the Old Notes tendered
hereby, the signature must correspond exactly with the name as written on the
face of the certificates without any change whatsoever.

     If any tendered Old Notes are owned of record by two or more joint owners,
all such owners must sign this Letter.

     If any tendered Old Notes are registered in different names on several
certificates, it will be necessary to complete, sign and submit as many separate
copies of this Letter as there are different registrations of certificates.

     When this Letter is signed by the registered holder of the Old Notes
specified herein and tendered hereby, no endorsements of certificates or
separate bond powers are required. If, however, the New Notes are to be issued,
or any untendered Old Notes are to be reissued, to a person other than the
registered holder, then endorsements of any certificates transmitted hereby or
separate bond powers are required. Signatures on such certificates must be
guaranteed by an Eligible Institution.

     If this Letter is signed by a person other than the registered holder of
any certificates specified herein, such certificates must be endorsed or
accompanied by appropriate bond powers, in either case signed exactly as the
name of the registered holder appears on the certificates and the signatures on
such certificates must be guaranteed by an Eligible Institution.

     If this Letter or any certificates or bond powers are signed by trustees,
executors, administrators, guardians, attorneys-in-fact, officers of
corporations or others acting in a fiduciary or representative capacity, such
persons should so indicate when signing, and, unless waived by the Issuer,
proper evidence satisfactory to the Issuer of their authority to so act must be
submitted.

     ENDORSEMENTS ON CERTIFICATES FOR OLD NOTES OR SIGNATURES ON BOND POWERS
REQUIRED BY THIS INSTRUCTION 3 MUST BE GUARANTEED BY A FIRM WHICH IS A MEMBER OF
A REGISTERED NATIONAL SECURITIES EXCHANGE OR A MEMBER OF THE NATIONAL
ASSOCIATION OF SECURITIES DEALERS, INC., BY A COMMERCIAL BANK OR TRUST COMPANY
HAVING AN OFFICE OR CORRESPONDENT IN THE UNITED STATES OR BY AN "ELIGIBLE
GUARANTOR" INSTITUTION WITHIN THE MEANING OF RULE 17AD-15 UNDER THE SECURITIES
EXCHANGE ACT OF 1934 (AN "ELIGIBLE INSTITUTION").

     SIGNATURES ON THIS LETTER NEED NOT BE GUARANTEED BY AN ELIGIBLE
INSTITUTION, PROVIDED THE OLD NOTES ARE TENDERED: (I) BY A REGISTERED HOLDER OF
OLD NOTES (WHICH TERM, FOR PURPOSES OF THE EXCHANGE OFFER, INCLUDES ANY
PARTICIPANT IN DTC WHOSE NAME APPEARS ON A SECURITY POSITION LISTING AS THE
HOLDER OF SUCH OLD NOTES) TENDERED WHO HAS NOT COMPLETED THE BOX ENTITLED
"SPECIAL ISSUANCE INSTRUCTIONS" OR "SPECIAL DELIVERY INSTRUCTIONS" ON THIS
LETTER, OR (II) FOR THE ACCOUNT OF AN ELIGIBLE INSTITUTION.

4. SPECIAL ISSUANCE AND DELIVERY INSTRUCTIONS.

     Tendering holders of Old Notes should indicate in the applicable box the
name and address to which New Notes issued pursuant to the Exchange Offer and/or
substitute certificates evidencing Old Notes not exchanged are to be issued or
sent if different from the name or address of the person signing this Letter. In
the case of issuance in a different name, the employer identification or social
security number of the person named must also be indicated. A holder of Old
Notes tendering Old Notes by book-entry transfer may request that Old Notes not
exchanged be credited to such account maintained at DTC as such holder of Old
Notes may designate hereon. If no such instructions are given, such Old Notes
not exchanged will be returned to the name or address of the person signing this
Letter.

5. TAX IDENTIFICATION NUMBER.

     Federal income tax law generally requires that a tendering holder whose Old
Notes are accepted for exchange must provide the Issuer (as payor) with such
Holder's correct Taxpayer Identification Number ("TIN") on Substitute Form W-9
below, which, in the case of a tendering holder who is an individual, is his or
her social security number. If the Issuer is not provided with the current TIN
or an adequate basis for an exemption, such tendering holder may be subject to a
$50 penalty imposed by the Internal Revenue Service. In addition, delivery of
New Notes to such tendering holder may be subject to backup withholding in an
amount equal to 31% of all reportable payments made after the exchange. If
withholding results in an overpayment of taxes, a refund may be obtained.

                                        9
<PAGE>   10

     Exempt holders of Old Notes (including, among others, all corporations and
certain foreign individuals) are not subject to these backup withholding and
reporting requirements. See the enclosed Guidelines of Certification of Taxpayer
Identification Number on Substitute Form W-9 (the "W-9 Guidelines") for
additional instructions.

     To prevent backup withholding, each tendering holder of Old Notes must
provide its correct TIN by completing the "Substitute Form W-9" set forth below,
certifying that the TIN provided is correct (or that such holder is awaiting a
TIN) and that (i) the holder is exempt from backup withholding, (ii) the holder
has not been notified by the Internal Revenue Service that such holder is
subject to a backup withholding as a result of failure to report all interest or
dividends or (iii) the Internal Revenue Service has notified the holder that
such holder is no longer subject to backup withholding. If the tendering holder
of Old Notes is a nonresident alien or foreign entity not subject to backup
withholding, such holder must give the Issuer a completed Form W-8, Certificate
of Foreign Status. These forms may be obtained from the Exchange Agent. If the
Old Notes are in more than one name or are not in the name of the actual owner,
such holder should consult the W-9 Guidelines for information on which TIN to
report. If such holder does not have a TIN, such holder should consult the W-9
Guidelines for instructions on applying for a TIN, check the box in Part 2 of
the Substitute Form W-9 and write "applied for" in lieu of its TIN. Note:
checking this box and writing "applied for" on the form means that such holder
has already applied for a TIN or that such holder intends to apply for one in
the near future. If such holder does not provide its TIN to the Issuer within 60
days, backup withholding will begin and continue until such holder furnishes its
TIN to the Issuer.

6. TRANSFER TAXES.

     The Issuer will pay all transfer taxes, if any, applicable to the transfer
of Old Notes to it or its order pursuant to the Exchange Offer. If, however, New
Notes and/or substitute Old Notes not exchanged are to be delivered to, or are
to be registered or issued in the name of, any person other than the registered
holder of the Old Notes tendered hereby, or if tendered Old Notes are registered
in the name of any person other than the person signing this Letter, or if a
transfer tax is imposed for any reason other than the transfer of Old Notes to
the Issuer or its order pursuant to the Exchange Offer, the amount of any such
transfer taxes (whether imposed on the registered holder or any other persons)
will be payable by the tendering holder. If satisfactory evidence of payment of
such taxes or exemption therefrom is not submitted herewith, the amount of such
transfer taxes will be billed directly to such tendering holder.

     EXCEPT AS PROVIDED IN THIS INSTRUCTION 6, IT IS NOT NECESSARY FOR TRANSFER
TAX STAMPS TO BE AFFIXED TO THE OLD NOTES SPECIFIED IN THIS LETTER.

7. WAIVER OF CONDITIONS.

     The Issuer and the Guarantors reserve the absolute right to waive
satisfaction of any or all conditions enumerated in the Prospectus.

8. NO CONDITIONAL TENDERS.

     No alternative, conditional, irregular or contingent tenders will be
accepted. All tendering holders of Old Notes, by execution of this Letter, shall
waive any right to receive notice of the acceptance of their Old Notes for
exchange.

     Neither the Issuer, the Guarantors, the Exchange Agent nor any other person
is obligated to give notice of any defect or irregularity with respect to any
tender of Old Notes nor shall any of them incur any liability for failure to
give any such notice.

9. MUTILATED, LOST, STOLEN OR DESTROYED OLD NOTES.

     Any holder whose Old Notes have been mutilated, lost, stolen or destroyed
should contact the Exchange Agent at the address indicated above for further
instructions.

10. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES.

     Questions relating to the procedure for tendering, as well as requests for
additional copies of the Prospectus and this Letter, may be directed to the
Exchange Agent, at the address and telephone number indicated above.

                                       10
<PAGE>   11

          TO BE COMPLETED BY ALL TENDERING HOLDERS (SEE INSTRUCTION 5)

                PAYOR'S NAME: KNOWLES ELECTRONICS HOLDINGS, INC.

<TABLE>
<S>                          <C>                                                         <C>
------------------------------------------------------------------------------------------------------------------------
  SUBSTITUTE                   PART I--PLEASE PROVIDE YOUR TIN IN THE BOX AT THE RIGHT
  FORMW-9                      AND CERTIFY BY SIGNING AND DATING BELOW.                   TIN: -----------------------
                                                                                             Social Security Number
                                                                                                   or Employer
                                                                                              Identification Number
                             -------------------------------------------------------------------------------------------
 Department of the
  Treasury, Internal           PART II--TIN Applied For [ ]
  Revenue Service              -----------------------------------------------------------------------------------------
                               CERTIFICATION -- UNDER THE PENALTIES OF PERJURY, I CERTIFY THAT:
  PAYOR'S REQUEST FOR
  TAXPAYER IDENTIFICATION      (1) the number shown on this form is my correct Taxpayer Identification Number (or I  am
      NUMBER ("TIN") AND       waiting for a number to be issued to me); and
      CERTIFICATION
                               (2) I am not subject to backup withholding because: (a) I am exempt from backup
                                   withholding, or (b) I have not been notified by the Internal Revenue Service  (the
                                   "IRS") that I am subject to backup withholding as a result of a failure to report
                                   all interest or dividend, or (c) the IRS has notified me that I am no longer
                                   subject  to backup withholding, and
                               (3) any other information provided on this form is true and correct.
                               -----------------------------------------------------------------------------------------

                               SIGNATURE ________________________________________  DATE: ________________
------------------------------------------------------------------------------------------------------------------------
</TABLE>

You must cross out item (2) of the above certification if you have been notified
by the IRS that you are subject to backup withholding because of underreporting
of interest or dividends on your tax return and you have not been notified by
the IRS that you are no longer subject to backup withholding.

YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX IN PART 2 OF
                              SUBSTITUTE FORM W-9

<TABLE>
<S>                                                                <C>
--------------------------------------------------------------------------------------------------
                      CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER

 I certify under penalties of perjury that a taxpayer identification number has not been issued to
 me, and either (a) I have mailed or delivered an application to receive a taxpayer identification
 number to the appropriate Internal Revenue Service Center or Social Security Administration
 Officer or (b) I intend to mail or deliver an application in the near future. I understand that
 if I do not provide a taxpayer identification number by the time of the exchange, 31% of all
 reportable payments made to me thereafter will be withheld until I provide a number.
  Signature: ______________________________________________________ Date: ---------------------
--------------------------------------------------------------------------------------------------
</TABLE>

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