... buzzer button system can show 3 groups of number at the same time Specification of Receiver K-998A1 with high strength Plastic ... :<20mA Working Frequency:315MHz±75k Dimension:260*120*42mm The Specification of call button K-L; 1.Wall Installed, waterproof ... , beauty salon, spa center, bars, swimming pool, beach, etcWhat are the components of the wireless calling system?1. Wireless receiver, installed on ...