1The receiving host has one-to-many pagers, and has 9 modes such as voice broadcast function, standby display time and perpetual calendar. 2It can receive over long distances, with 500 calling extensions, digital and Chinese service categories can be displayed at the same time. 3It is mainly used in catering services, administrative offices, leisure and entertainment industries. 4The caller uses aeronautical communication special parts to ensure its signal transmission and stability. 5Built-in channel anti - mixing function, built-in timing circuit design.Features: The receiving host has one-to-many pagers, and has 9 modes such as voice broadcast function, standby display time and perpetual calendar.It can receive over long distances, with 500 calling extensions, digital and Chinese service categories can be displayed at the same time.It is mainly used in catering services, administrative offices, leisure and entertainment industries.The caller uses aeronautical communication special parts to ensure its signal transmission and stability.Built-in channel anti - mixing function, built-in timing circuit design.Specifications: Working Voltage: 12V Working Current: 1A Matching Capacity: 500 Pagers Operating Frequency: 433MHz Color: Red and WhiteBattery: Built-in 12V 23A Battery (Included) Optional Plug: US Plug, EU Plug, UK PlugReceive Host Size: Approx. 23*16*3cm/9.1*6.3*1.2in Caller Size: Approx. 6*6*2cm/2.36*2.36*0.79in Package List: 1* Receiving Host 7* Pager 1* English Manual 1* Adapter Power Cord