Product Details： Wireless Calling System Advantages:save Labour Cost,improve Service Image,most Important, Improve Efficiency How We Use The Wireless Calling System:first, The Calling Buttons Are Pasted Or Put On The Wall Or On The Table, When The Guest Have Any Service, He Or She Press The Calling Buttons, The Receiver (led Screen Or Watch Pager) Will Get Signal With Vibration Or Sound, Showing The Table Number, Then The Waiter Will Know Which Table To Be Served. Multiple Language Watch Receiver:russian, English, Ukrainian, Spanish, German, French, Italian, Or We Could Customize Your Language As Your Requiement. 3 Prompts Modes:vibration, Beep, Light Flash; You Can Set Freely. Wireless Call Button Transmitter Specification:call Button Frequency:433mhz Modulation Mode:ask (am) Decoding:learning Code Working Current:17ma Emission Distance:100m (open Area) Watch Receiver Pager Specification:capacity: 500 Pcs Of Pager Transmitters Alert Mode: Vibration,beep And Ring Sensitivity:-110dbm Frequency:433.92mhz Capacity:500 Pcs