公告日期：2025-11-24

協同通信集團有限公司

Synertone Communication Corporation

(Incorporated in the Cayman Islands with limited liability)

（於開曼群島註冊成立之有限公司）

(Stock Code: 1613)

（股份代號：1613）

NOTIFICATION LETTER 通知信函

24 November 2025
Dear Registered Shareholder(s),

Synertone Communication Corporation (the “Company”)

Notification of publication of Circular, Notice of Extraordinary General Meeting and Proxy Form (the “Current Corporation Communication”)

The English and Chinese versions of the Company’s Current Corporate Communications are now available on the Company’s website at www.synertone.net and the website of The
Stock Exchange of Hong Kong Limited (the “Stock Exchange”) at www.hkexnews.hk respectively (the “Website Version”). The Company strongly recommends you to access the
Website Version of the Current Corporate Communication and all future Corporate Communications . (Note) If you have elected to receive the Corporate Communications in printed
form, the Current Corporate Communication is enclosed.

If you for any reason have difficulty in receiving email notification or gaining access to the Website Version of the Corporate Communications and would like to receive the Current
Corporate Communication and all future Corporate Communications in printed form, please complete, sign the enclosed Reply Form and return it to the Company’s branch share
registrar in Hong Kong, Tricor Investor Services Limited (“Branch Share Registrar”) at 17/F, Far East Finance Centre, 16 Harcourt Road, Hong Kong by post using the provided
prepaid mailing label (no stamp is needed if posted in Hong Kong) or by email to 1613-ecom@vistra.com. The Company will p……
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