Model Number: TSYK200-2 Brand Name: CallingSYS Key Specifications/Special Features: This is 200 meters umbrella waterproof transmitter. It works with 99 channel receivers, which have learning code and fixed code two different models. This kind of transmitter can be tied on the umbrella 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 umbrella or room needs service.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.Features: 1. RF wireless transmission2. Tie to the umbrella pole on the beach or in square3. Fully waterproof4. Battery power supply, no need wiresTechnical data: