Canon Audio Device Ltd - Manufacturer of professional audio equipment including alarms, contained two tone sirens and indoor speakers. www.canonaudio.com.hk
CP Compact Products Ltd - Manufacturer and exporter of clock radios and car audio systems. www.cpcompact.com
PRO-SYS ICS - Manufacturer of conference equipment such as microphones, simultaneous interpretation systems and computer controlled voting systems. www.prosys.com.hk
