For those wondering what the message in Vietnamese says, here is the translation:
Thanh Trung Mobile is a reputable electronic device repair system, established in 2006 in Ho Chi Minh City. This center specializes in providing repair services for a variety of devices from phones, tablets, to smart watches. With over 16 years of experience, Thanh Trung Mobile is proud of its team of professional and dedicated technicians, along with the use of genuine components and modern equipment to ensure service quality. Customers can find screen replacement, battery replacement, hardware repair, and many other utilities at Thanh Trung Mobile.
Perhaps he has, for some reason, seen a market to supply thousands of pagers and walkie-talkies!