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 or on the table, when the guest have any service, he or she the calling buttons, the receiver (LED screen or watch pager) get signal with vibration or sound, showing the table number, then the waiter 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 of pager transmitters Alert Mode:vibration,ring or flash Receive Sensitivity:-110dbm power supply mode:250mAh lithium battery Standby Time: (in ideal conditions) Frequency:433.92MHZ Compatible with 1, 2, 3, 4, 5 buttons Upgrade the function, key value assignment longer standby time Note: Due to different production batches, there may be slight differences in products. Specifications: A: blue button Colour:Photo Color Material:ABS Package Contents: 1 x watch receiver 5 x call buttons Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.