Document:

<PAGE>

                                                                    EXHIBIT 4.22

                               DEED OF ASSIGNMENT

This Deed of Assignment (the "Deed") is entered into as of the day of September
2004 by and between

NAMTAI ELECTRONIC (SHENZHEN) CO., LTD., a company existing and incorporated
under the laws of the Peoples' Republic of China ("PRC") with registered address
at Gu Su Industrial Estate, Xixiang, Baoan, Shenzhen, PRC (the "ASSIGNOR"); and

NAM TAI ELECTRONICS, INC., an International Business Company incorporated in the
British Virgin Islands, in accordance with Part V, Section 51 of the
International Business Companies Ordinance, 1984 (the "ASSIGNEE").

WHEREAS,

1.    The Assignor is the registered owner in PRC of trademark numbers 3465621
      and 3465622, particulars of which are set out in the Schedule hereto
      ("TRADEMARKS"); and

2.    The Assignor desires to assign to the Assignee all the property, right,
      title and interest in and to the Trademarks in accordance with the terms
      and conditions of this Deed.

NOW THIS DEED WITNESSES AND IT IS AGREED as follows:

1.    Assignment of Rights

      The Assignor hereby assigns and transfers to the Assignee all of its
      property, right, title and interest in and to the Trademarks, and the
      Assignee hereby accepts such assignment (the "ASSIGNMENT").

2.    Effective Date

      Subject to approval of the Assignment by the Trademark Office of PRC, the
      Assignment shall take effect from the date of publication of the approval
      of the Assignment.

3.    Undertaking by Assignee

      The Assignee hereby undertakes to the Assignor that all goods pursuant to
      which the Trademarks are licensed to be used shall conform to the
      standards
<PAGE>

      of quality and specifications as laid down by the Assignor.

4.    Miscellaneous

4.1   This Assignment constitutes the entire agreement between the parties
      hereto with respect to the subject matter hereof and supersedes any
      previous expression of intent, undertaking or agreement with respect to
      this transaction.

4.2   This Assignment may be executed in any number of counterparts and by the
      parties to this Assignment on separate counterparts, each of which when
      executed and delivered shall be an original but all the counterparts shall
      together constitute one and the same instrument.

5.    Governing Law

      This Assignment shall be governed by and construed in accordance with the
      laws of PRC.

EXECUTED as a deed under seal by the parties.

<PAGE>

                                  THE SCHEDULE

PRC

<TABLE>
<CAPTION>
                                                 Goods and Services in
                                                 respect of which the
Trademark            Registration Number  Class  Trademarks are registered
---------------      -------------------  -----  -------------------------
<S>                  <C>                  <C>    <C>
Namtai & device
(English)            3465622              9      Calculators, electronic
                                                 dictionaries, video camera,
                                                 digital camera, batteries,
                                                 headphone, connector
                                                 (data processing
                                                 equipment), computer,
                                                 reader (data processing
                                                 equipment), mobile phone,
                                                 peripheral products of
                                                 computers, interface of
                                                 computers

Namtai & device
(Chinese)            3465621              9      Calculators, electronic
                                                 dictionaries, video camera,
                                                 digital camera, batteries,
                                                 headphone, connector
                                                 (data processing
                                                 equipment), computer,
                                                 reader (data processing
                                                 equipment), mobile phone,
                                                 peripheral products of
                                                 computers, interface of
                                                 computers
</TABLE>

<PAGE>

SIGNED SEALED AND DELIVERED)
by Wong Kuen Ling                               )
as the lawful attorney of                       )
Namtai Electronic (Shenzhen) Co., Ltd.          )

Witnessed by:

___________________________________________
Name:
Title:

Signed by                                       )
For and on behalf of                            )
Nam Tai Electronics, Inc.                       )

Witnessed by:

___________________________________________
Name:
Title:<PAGE>

                                                                    EXHIBIT 4.23

[HSBC LOGO]

      Commercial Banking - Division A (Level 10)
Ref:  (CARM Serial No. 040827)

'CONFIDENTIAL

Nam Tai Group Management Ltd
15/F China Merchants Tower
Shun Tak Centre
168-200 Connaught Road Central
Hong Kong                                                      24 September 2004

Attn: Mr. T. Murakami / Mr. S. K. Cheung

Dear Sirs

BANKING FACILITIES
A/C NO. 500-815287

With reference to our recent discussions, we are pleased to advise that we have
reviewed your banking facilities and offer a renewal within the following
revised limits which will be made available on the specific terms and conditions
outlined below. These revised facilities are subject to review at any time, and
in any event by 31 May 2005, and also subject to our overriding right of
suspension, withdrawal and repayment on demand, including the right to call for
cash cover on demand for prospective and contingent liabilities. This letter
supersedes our previous letter dated 9 September 2004 which should be returned
to us for cancellation.

<TABLE>
<CAPTION>
                                                                         New Limit          Previous Limit
                                                                         ---------          --------------
<S>                                                                   <C>                   <C>
Overdraft                                                             HKD500,000.-          HKD500,000.-
Interest on the overdraft facility will be charged on
daily balances AT OUR HKD BEST LENDING RATE (PREVIOUSLY
at 0.5% per annum over our HKD best lending rate),
which is currently 5.125% per annum, but subject to
fluctuation at our discretion and payable monthly in
arrears to the debit of your current account.

Treasury Facilities                                                   USD30,000,000.-       USD30,000,000.-

within which:

  Foreign Exchange:                                                   (USD30,000,000.-)     (USD30,000,000.-)

  -     For booking forward exchange contracts with
        individual contracts up to a maximum of 6 months'
        duration.

  Currency Option-                                                    (USD30,000,000.-)     (USD30,000,000.-)

  -     maximum maturity: up to a maximum of 6 months
        forward
</TABLE>

THE HONGKONG AND SHANGHAI BANKING CORPORATION LIMITED
Hong Kong Main Office: 1 Queen's Road Central, Hong Kong
Tel: 2822 1111 Fax:
Telex: 73205 HSBC HX Telegrams: Hongbank Hongkong
Web: www.hsbc.com.hk

<PAGE>

[HSBC LOGO]

Nam Tai Group Management Ltd         - 2 -                    24 September 2004

Terms and Conditions

Contracts for treasury products may only be entered into under these facilities
to cover exchange rate exposure incurred in the normal course of your business.

All treasury product facilities remain subject to our overriding right to call
for cash cover on demand if in the Bank's view your mark-to-market position with
us requires such cover. Further, the Bank may, after having made reasonable
attempts to discuss the position with yourselves, close out any or all of your
outstanding treasury products contracts and demand settlement of the balance
due.

All spot and forward foreign exchange transactions and all currency option
transactions shall be subject to the terms of a Master Agreement in form
published by the International Swaps and Derivatives Association ("ISDA").

<TABLE>
<CAPTION>
                                                          New limit            Previous Limit
                                                          ---------            --------------
<S>                                                       <C>                  <C>
Corporate Card                                            HKD1,100,000-        HKDl,100,000.-

at our Card Centre

(The terms and conditions governing the Corporate Card
Facility are detailed in our HSBC Corporate Card
Programme - Employer's Participation Agreement duly
signed by you)

IMPORT/EXPORT FACILITIES                                      NIL              HKD60,000,000. -

Documentary Credits with import finance up to 90 days,
less any usance/credit periods granted by your
suppliers, and/or D/P bills purchased on approved
drawees.

WITHIN WHICH                                                  NIL              (HKD60,000.000.-)

Goods under your control and/or Trust Receipts.

Default Interest                                               -                              -
</TABLE>

Please note that interest will be payable on sums which are overdue, drawings
which are in excess of agreed limits and amounts demanded and not paid, at the
maximum rate stipulated in the Bank's Tariff which is accessible at
http://www.hsbc.com.hk/Hk/'business/tool/pdf/c_tariff.pdf. The Bank will
provide you with a hard copy of the Tariff at your request. Interest at the
applicable rate will be payable monthly in arrears to the debit of your current
account.

Accrual of Interest and Other Sums

Please note that interest and other sums expressed to be chargeable or payable
on a periodic basis will nonetheless accrue from day to day and amounts so
accrued may be demanded at any time.

<PAGE>

[HSBC LOGO]

Nam Tai Group Management Ltd                 -3-              24 September 2004

In addition, all costs and expenses (including legal fees) incurred by us in
connection with the extension of these facilities and any matters arising are to
be reimbursed by you on demand.

Security

As security, we continue to hold an Unlimited Corporate Guarantee dated 26 April
2001 from Nam Tai Electronics Inc, covering facilities to Nam Tai Group
Management Ltd, together with a supporting board resolution dated 26 April 2001
authorizing its issuance.

AS DISCUSSED, WE ARE AGREEABLE TO THE RELEASE OF THE NEGATIVE PLEDGE TOGETHER
WITH A SUPPORTING BOARD RESOLUTION BOTH DATED 8 AUGUST 1995 FROM NAM TAI
ELECTRONICS INC UNDERTAKING NOT TO PLEDGE ANY SECURITY WITH ANY BANKS WITHOUT
OUR PRIOR APPROVAL. IT SHALL BE RETURNED TO YOU FOR CANCELLATION.

Please arrange for the AUTHORIZED SIGNATORIES OF YOUR COMPANY, in accordance
with the terms of the mandate given to the Bank, to sign and return to us the
duplicate copy of this letter to signify your confirmation as to the correctness
of the security held, and your continued understanding and acceptance of the
terms and conditions under which these revised facilities are granted.

These revised facilities will remain open for acceptance until the close of
business on 14 October 2004 and if not accepted by that date will be deemed to
have lapsed.

We are pleased to be of continued assistance.

Yours faithfully

/s/ PETER CHOI                                For and on behalf of
Peter Choi                                    NAM TAI GROUP MANAGEMENT LIMITED
Relatoinship Manager
                                              /s/ T. MURAKAMI
                                              -------------------------------
                                              Authorized signature 24F

Encl

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