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 Material: ABS Watch Receiver Parameters: Number of Connected Pagers: 500 Alert Mode: Vibration, Beep, Blinking Receiving Sensitivity: ‑110dBm Call Information Storage Capacity: 20 Groups Battery Type: Lithium Battery Battery Capacity: 250mAh (included) Standby Time: 7 Days Button Pager Parameters: Operating Frequency: 433.92MHz Battery: DC12V Battery Type: Alkaline Battery (23A 12V Battery) Single Pager Battery Capacity: 60mAh (included) Transmit Current: 10mA±3mA Standby Current: <1uA Open Distance: >200 Meters Keystroke: 1,000,000 Times Waterproof Rating: IPX4 Operating Temperature: ‑20℃ to 55 Four Keys: Call (CALL) Checkout (BILL), Cancel (CANCEL) Wine (WATER) 1 x Watch Receiver 10 x Pager 1 x Charger 1 x Charging Cable 1 x Instruction Manual