SINGCALL Wireless Calling System, Wireless Waiter Service System, for Bank, Pack of 5 Buttons and 1 Watch, For Restaurant,Cafe, Fast Food Restaurant,Hotel,Club,Bar,Night Club,Hospital,Factory,Office Need more watch receivers or pagers? Please search B00EC6P0K8 or B00EB6X00Q on Amazon. APE6600: 01.Without any host or control center, directly 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. APE560: 01.Equipped with waterproof base 02.Stable login mode 03.Anti-temperature and humidity changes 04.The number can be changed optionally with strong re-use ability Specifications:2.17*1.77*0.6 inches(55*45*18mm) Frequency:433MHZ Sound Type:Music/Vibration Standby Time:30 days long With Pager Quantity:999PCS Receiver Sensitivity:-114dbm Power Supply:AAA battery Call output: 20db UV/m Frequency: 433MHZ Frequency deviation: 0.5 Mhz Specifications: 2.36*2.36*1.26 inches(60*60*32mm) Call distance: 130-200ft indoors, 1600ft in the open air Power Supply: Alkaline Battery 12V 23A