Feature: 1. 3 Alert Modes: The pager system supports vibration, buzzer, flash alerts, allowing you to choose vibration with flash mode to ensure customers are promptly notified. 2. Extended Range: With advanced FM technology, the buzzer system achieves a work range over 1640ft, convenient for customers to wait in spacious areas or in their cars. 3. Convenient Use: The beeper pager system enables the checking of last 10 call history, very convenient feature to check which customer missed their call. 4. Long Battery Life: With built in 200mAh rechargeable batteries, these beeper buzzers ensure long standby time of up to 12 hours. It keeps the pager running without interruption, particularly during long operational hours of the restaurant or cafe. 5. Enhanced Performance: The coffee pager system is designed with a large volume and longer charging dock, making it easier to charge and providing better stability while charging. The pager won't easily fall off, ensuring a smoother charging process. Specification: Item Type: Restaurant Pager System Main Unit: Input Power: DC12V/2A Transmission Frequency: 433.92MHz Transmission Distance: Approx. 500m / 1640ft Charging Sub Unit Number: 20 Compatible Sub Unit Number: 998 Key Mode: Touch sensitive keys Sub Unit: Reception Frequency: 433.92MHz Reception Sensitivity: -108dBm Transmission Distance: Approx. 500m / 1640ft Standby Time: 12 Hours Alert Modes: Vibration / Beep / Flash Alert Duration: 1-999 seconds Single Sub Unit Battery: Built in 200mAh Polymer Lithium Battery (Included) . Package List: 1 x Main Unit20 x Sub Unit1 x Adapter1 x User Manual