SINGCALL Wireless Calling System, Wireless Waiter Pager System, for Supermarket, for Restaurant, Cafe, Coffee Shop. Pack of 5 Pcs Table Buttons and 1 Pc Wrist Watch Receiver Need more watch receivers or pagers? Please search B00EC6P0K8 or B00EC57NZY on Amazon. APE6600: 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. APE700: 01. Diffusion color dream light 02. Launch of high sensitivity, superior touch buttons 03. Super stable registration way, without any messy code phenomenon 04. The functions of temperature, humidity change resistance, with security, stability, reliability. Specifications:2.17*1.77*0.6 inches(55*45*18mm) Us Frequency Range: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*0.43 inches(60*60*11mm) Call distance: 130-200ft indoors, 1600ft in the open air Power Supply: button cell CR2025 3V