... factories, nursing homes, clubs,etc. Wireless Calling System / Table Calling System / Hotel Service System:Main function:(1) The system is made up of one receiver, ... (operated by 1 pc 12V 23A battery), HE Calling transmitter (optional), HB Infrared inductive alarm transmitter (optional ... POSITION means the number of the table, hotel room, worker, sickbed, or other places you can use this calling system.