1、MULTI FUNCTIONAL: Queue calling system with vibration, beep, flash alert modes. Wireless range up to 500 meters, the timing time can be set from 1 to 999 seconds. 2、EXTENDED RANGE: Utilizing advanced frequency modulation technology, the paging system works over 1640+ feet. Ideal for customers waiting in spacious areas or inside their vehicles. 3、CONVENIENT VIEWING: The restaurant calling system allows you to check the last 10 call records, making it easy to identify missed calls by customers, giving you more convenience. 4、LARGE CAPACITY BATTERY: Each restaurant calling device is equipped with a built in 100mAh rechargeable battery, providing up to 12 hours of standby time. 5、STABLE AND DEPENDABLE: The restaurant buzzer has a large volume, longer charging dock, making charging easier and more stable, ensuring no detachment during charging. Item Type: Restaurant Pager System Material: Plastic + Electronics Main Unit: Input Power: DC12V 2A Transmitting Frequency: 433.92MHz Transfer Distance: Approx. 500m / 1640ft Number of Charging Units: 16 Number of Compatible Units: 998 Button Mode: Touch Button Sub Unit: Receiving Frequency: 433.92MHz Receiving Sensitivity: -108dBm Transfer Distance: Approx. 500m / 1640ft Standby Time: 12 hours Notification Method: Vibration Buzzer Flash Reminder Duration: 1-999 seconds Battery Type: Built in 100mAh Polymer Battery 1 x Main Unit 16 x Sub Unit 1 x Plug 1 x User Manual