SINGCALL Wireless Calling System,For Cafe,Call Waiter,Call Nurse,New Generation Watch Receiver,Big Screen, Pack of 5 Pagers and 1 Watch Receiver(APE6800) Need more watch receivers or pagers? Please search B018V8MQYU or B00EB6X00Q on Amazon. APE6800: 1. Big color OLED screen, thinner, lighter and more flexible anti-seismic and knock, can bear low temperature, self-luminous, big visual angle, can see the information clearly. Do not need backlighting, low energy consumption 2. Rechargeable design, avoiding the trouble of changing batteries frequently, long stand-by time (about 10 days).3. With encryption function, avoiding information lost by mistake operation. 4. With fast delete function, can delete the one or all calling information by one button. 5. Assorted with charged software, users can define the showing information, advertisement information and colors. Can also make registration more simple. APE560: 01.Equipped with waterproof base 02.Stable login mode 03.Anti-temperature and humidity changes04.The number can be changed optionally with strong re-use ability Specification: 1.57*2.05*0.59 inches(40*52*15mm) Function keys: DOWN, ENT, FUN Number of display: Display one group number and store 10 numbers scrolling display. Battery: Rechargeable lithium battery Call button/pager capability: 399 Prompt mode: vibration, bell, vibration and bell. Number deleting mode: manually, automatically Screen: Color OLED Display resolution: 128*128 Receiver sensibility: -114dBm Frequency: 433.92MHz Battery life: Million times Work temperature:30-120 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