ADD: Room 504, President Commercial Centre, 608 Nathan Road, Mongkok, Kowloon, HK
wall speaker
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ceiling speakersThe ceiling speaker, also known as the ceiling speaker, is an important member of the public address system. It is an electro-acoustic conversion device installed on the ceiling. It is used to convert the audio electric power signa
Room 504, President Commercial Centre, 608 Nathan Road, Mongkok, Kowloon, HK
No.9, Street 4, Xiangmang Xilu South,Qingxi Town, Dongguan, GD, China
