... cafes, factories, nursing homes, clubs, etc. Wireless Calling Service System / Table Calling System / Hotel Service System:Main function:(1) The system ... by 1 pc 12V 23A battery), HE Calling transmitter (optional), HJ Multi-function calling transmitter (optional), HB Infrared inductive alarm ... it can show you 9 times at most the customer calling). It can match 990 transmitters at most, every position ...