1、LONG LIFE BATTERY: Wireless calling system built in large capacity battery, possess long life, no frequent charging 2、PERMANENT CALL HISTORY: Call history of wireless calling system is not lost even if power is lost or factory is restored 3、FLEXIBLE CALLING: The wireless calling pager system has 33 kinds of call instructions, which can be set freely to adapt to different scenarios 4、HUMANIZED DISPLAY: Restaurant wireless calling system has LCD display, humanized menu operation, easy to use 5、MULTIPLE PROMPTS: Queue wireless calling system support the combination of vibration and ringtone prompts, and display the perpetual calendar Item Type: Wireless Calling System Watch Receiver Parameters: Number of Connected Pagers: 500 Prompt Mode: Vibration, buzz, flicker Receiving Sensitivity: -110dBm Call Information Storage Capacity: 20 Groups Battery Type: Lithium battery Battery Capacity: 250mAh Standby Time: 7 Days Button Caller Parameter Description: Operating Frequency: 433.92MHz Battery: DC12V Battery Type: Alkaline battery (23A 12V) Single Pager Battery Capacity: 60mAh Transmitting Current: 10mA±3mA Standby Current: <1uA Open Distance: >200meters Keystrokes: 1 Million times Waterproof Rating: IPX4 Operating Temperature: -20℃~ 55℃ Three Keys: CALL, BILL, CANCEL 1 x Wristwatch Receiver 5 x Pager 1 x Charger 1 x Charging Cable 1 x User Manual