Feature: 1. 3 Reminder Modes: This wireless calling system has 3 reminder modes: vibration, buzzing, and flashing; When playing live music, vibration and flashing modes can be selected to better remind customers 2. Long Distance: Using advanced frequency modulation technology, the paging system has a working distance of over 800 meters (2625ft), making it convenient for customers to wait in open areas or in their own cars 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 improving work efficiency 4. Built in Battery: Each restaurant pager has a built in 200mAh rechargeable battery with a standby time of up to 20 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: 433MHz Transmitting Distance: Approx. 800m / 2624.7ft (open visual distance) Number of Charging Sub Machine: 24 Number of Compatible Sub Machine: 998 Key Mode: Touch Key Size: Approx. 230 x 226 x 31mm / 9.1 x 8.9 x 1.2in Sub Unit: Receiving Frequency: 433MHz Receiving Sensitivity: -108dBm Transmitting Distance: Approx. 800m / 2624.7ft (open visual distance) Standby Time: 20 hours Prompt Methods: Vibration, Buzzer, Flash Reminder Duration: 1-999 seconds setting Single Sub Machine Battery: 200mAh Lithium Polymer Battery (Built in). Package List: 1 x Main Unit 24 x Sub Units 1 x Main Unit Antenna 1 x Adapter 1 x User Manual