Now our wireless calling systems are widely used in fast food restaurant, food court, clinic, , hospitals, spa & salons and or other queue occasions. They are welcomed and popular. Save labour cost Improve service image Most important, improve efficiency How to 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 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. Specification for Call Button: Call button frequency:433MHz Modulation mode:ASK (AM) Decoding:learning code Working current:17mA Power:12V/23A battery (included) Emission Distance:500m (open area) Specifications for Receiving host: Modulation Mode:ASK (AM)RF Frequency:433.92MHz Working Chip:Learning Code Power Supply:DC 12V1A Transmission Distance:Up To 100 Meters (in open area) Working Temperature:-20 to 55 Plug Type: US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Voltage: AC110V Colour:Photo Color Material:ABS Package Contents: 1 x Display host 5 x Call button 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.