Smart Digital Technology Group Limited — Proxy Solicitation & Information Statement 2005

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SUN INNOVATION HOLDINGS LIMITED

(Incorporated in Bermuda with limited liability)

(Stock Code : 0547)

FORM OF PROXY FOR SPECIAL GENERAL MEETING

I/We (Note 1)

of

shares (Note 2) of HK$0.01 each in the share capital of the

being the registered holder(s) of shares (Note 2) Company, hereby appoint THE CHAIRMAN OF THE MEETING (Note 3) or of

to act as my/our proxy at the Special General Meeting of the Company to be held at 3/F., Chung Nam Building, 1 Lockhart Road, Wanchai, Hong Kong on Friday, 23 September 2005 at 10:00 a.m. and at any adjournment thereof for the purpose of considering and, if thought fit, passing, with or without amendments, the resolution as set out in the notice convening the said meeting as an ordinary resolution of the Company and to vote on my/our behalf as indicated below.

Dated the

day of 2005 Signature

Notes:

1. Full name(s) and address(es) are to be inserted in BLOCK CAPITALS . The names of all joint registered holders should be stated.

2. Please insert the number of shares registered in your name(s). If no number is inserted, this form of proxy will be deemed to relate to all the shares in the capital of the Company registered in your name(s).

3. A proxy need not be a member of the Company but must attend the meeting to represent you. If you wish to appoint some person other than the Chairman of the meeting as your proxy, please strike out (Note 9) the words “THE CHAIRMAN OF THE MEETING” and insert the name and address of the proxy desired in the space provided. You may appoint more than one proxy to attend and vote at the meeting provided that if more than one proxy is so appointed, the appointment shall specify the number of shares in respect of which each such proxy is so appointed. If no name is inserted, the Chairman of the meeting will act as proxy.

4. If you wish to vote for the resolution, please tick (“✓”) the box marked “FOR”. If you wish to vote against the resolution, please tick (“✓”) the box marked “AGAINST”. If this form is returned and duly signed but without specific direction on the proposed resolution, the proxy will vote or abstain at his discretion. A proxy will also be entitled to vote at his discretion on any resolution properly put to the meeting other than those set out in the notice convening the meeting.

5. In the case of a joint holding, this form of proxy may be signed by any joint holder, but if more than one joint holder is present at the meeting, whether in person or by proxy, that one of the joint holder whose name stands first on the register of members in respect of the relevant joint holding shall alone be entitled to vote in respect thereof.

6. This form of proxy must be signed by you or your attorney duly authorised in writing, or in the case of a corporation, must be either executed under its common seal or under the hand of an officer or attorney duly authorised.

7. To be valid, this form of proxy together with any power of attorney or other authority (if any) under which it is signed or a notarially certified copy of such power or authority must be deposited at the office of the Company’s branch Share Registrars in Hong Kong, Computershare Hong Kong Investor Services Limited, at 46th Floor, Hopewell Centre, 183 Queen’s Road East, Hong Kong not less than 48 hours before the time of the meeting or any adjourned meeting.

8. Completion and delivery of this form of proxy will not preclude you from attending and voting at the meeting if you so wish.

9. Any alteration made to this form must be initialled by the person who signs the form.