... cafes,factories, nursing homes,amusement parks,etc. Wireless Calling System Transmitter / Multi-function Calling Transmitter HJ/ Hotel service system / Table calling ... system: 1. Transmitter HJ can match receiver 801, 802. 2. Applicable places: ... amusement parks, clubs, families, etc. 3. The distance between transmitter HJ and the receiver can be up to 500m in ...