Feature: 1. 3 Reminder Methods: This wireless calling system has 3 reminder methods, vibration, buzzer, and flashing; When playing live music, vibration and flashing modes can be selected to better remind customers 2. Longer Distance: Using advanced frequency modulation technology, the paging system has a working distance of over 500 meters (1640ft), making it convenient for customers to wait in open area or in their own car 3. Calling Record: The restaurant calling system can view the last 10 call records, making it convenient to know which customer missed calling, reducing unnecessary trouble, and greatly improving work efficiency 4. Built in Battery: Each restaurant pager has a built in 200mAh rechargeable battery with a standby time of up to 24 hours, which is convenient and practical, without the need to connect to a power source 5. Stable Charging: The wireless calling system host has a sturdy structure and longer charging stations, making it easy to charge the receiver. It is stable and does not detach, making it ideal for use in restaurants Specification: Item Type: Wireless Calling System Main Unit: Input Power: DC12V 2A Transmitting Frequency: 433.92MHz Transmissing Distance: Approx. 500m / 1640.4ft Number of Compatible Sub Machine: 998 Key Mode: Touch Key Size: Approx. 270 x 290 x 32mm / 10.6 x 11.4 x 1.3in Sub Unit: Receiving Frequency: 433.92MHz Receiving Sensitivity: -108dBm Transmissing Distance: Approx. 500m / 1640.4ft Standby Time: 24 hours Prompt Methods: Vibration, Buzzer, Flash Reminder Duration: 1-999 seconds setting Single Sub Machine Battery: 200mAh Polymer Lithium Battery (Built in) Size: Approx. 50 x 100 x 10mm / 2 x 3.9 x 0.4in. Package List: 1 x Main Unit30 x Sub Units1 x Main Unit Antenna1 x Adapter1 x User Manual