SINGCALL Wireless Pager Calling System, Restaurant Paging Systems, Wrist Receiver. Comptablie with Single Call Button and Mulit Buttons(APE6600)it Can't Be Used Alone!! 01.Directly receive signals of pager(s), convenient to take. Show the time when on standby mode. 02.With sleep mode, saving power and avoid disturbing when do not use. . 03.Two prompt modes of vibration or beep, the length of vibration can be set from 1-5 seconds. 04.'Lock the watch' function, can aviod misoperation. 05.Frequently Asked Questions attached in the last page of manual, can solve most problems. Specifications:2.17*1.77*0.6 inches(55*45*18mm) Us Frequency Range:433MHZ Sound Type:Beeper/Vibration Standby Time:30 days long With Pager Quantity:999PCS Receiver Sensitivity:-114dbm Power Supply:AAA battery (For the multi-button pagers, the mantissa on the right means different call functions, 1 means Order, 2 means Drinks/Water, 6 means Service, 8 means Bill. For example, 001-6 means that 001 is paging for Service. 007-8 means that 007 is paging for Bill. When the key Cancel of the pager is pressed, the calling number on the screen disappears and it means the service is done.)