Feature: 1. LONG BATTERY LIFE: Wireless calling system has a built in high capacity battery that does not require frequent charging, ensuring long time usage. 2. PERMANENT CALL RECORDS: Call records will not be lost even after power failure or restoration of the factory, which is convenient for tracking and management. 3. MULTIPLE CALL COMMANDS: 33 built in call commands can be freely set to adapt to different use scenarios and improve efficiency. 4. EASY TO USE: LCD screen display and humanized menu operation, easy to use. With 20 groups of call record storage, you can easily keep track of customer requests and respond promptly. 5. MULTIPLE PROMPTING METHODS: Vibration, ringing and other prompting methods, timely and effective reminder, and both the perpetual calendar display function. Specification: Item Type: Wireless Calling System Material: ABS Watch Receiver: 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 Push Button Pager: Operating Frequency: 433.92MHz Battery: DC12V Battery Type: Alkaline Battery (23A 12V Battery) Single Pager Battery Capacity: 60mAh (included) Transmit Current: 10±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). Package List: 1 x Watch Receiver20 x Pager1 x Charger1 x Charging Cable1 x Instruction Manual