This is 500 meters transmitter. It works with 999 channel receivers, with learning code technology. This kind of transmitter can be put on the table or stick on the wall. When the customers need service, he/she just press the button, the receiver will receive a RF signal and know which table or room needs service.The new design makes it easy to change the battery.

Wireless Calling System is a kind of electronic product providing calling service. It uses latest RF technology which includes software and hardware. No need wiring, it is widely used in restaurant, cafe, bar, KTV, club, shop, hospital and so on.