Feature: 1. MULTIPLE REMINDER MODES: The restaurant buzzers feature vibration, beep, and flash alerts, providing versatile options for notifying customers. For added convenience, can choose the vibration and flash mode when live music is playing. 2. EXTENDED COVERAGE: Utilizing advanced frequency modulation technology, the paging system offers a working distance of up to 2624.6-3280.8 feet, allowing customers to wait comfortably in open spaces or inside their vehicles without missing their call. 3. CONVENIENT TRACKING: The restaurant paging system enables users to view the ten most recent call records, making it easy to identify which customers may have missed their notification. 4. LONG LASTING BATTERY: Each wireless restaurant buzzer is equipped with a built in 300mAh rechargeable battery, providing up to 24 hours of standby time for uninterrupted service. 5. STABILITY AND DURABILITY: The restaurant buzzers are designed with a large volume, longer charging docks, and a secure charging mechanism to ensure stability during charging. Specification: Item Type: Restaurant Buzzers Material: ABS+Electronic Host: Input Power: DC12V/2A Transmission Frequency: 433.92MHz Transmission Distance: 800-1000m / 2624.6-3280.8ft Number of Connectable Subunits: 998 Key Mode: Touch Key Beepers: Receiving Frequency: 433.92MHz Receiving Sensitivity: -115dBm Transmission Distance: 800-1000m / 2624.6-3280.8ft Standby Time: 24 hours Notification Methods: Vibration/Beeper/Flash Reminder Duration: Adjustable from 1 to 999 seconds Single Subunit Battery Type: Built in 300mAh Polymer Lithium Battery (included). Package List: 1 x Main Unit 20 x Beepers 1 x Main Unit Antenna 1 x Adapter 1 x User Manual