1It has a number one to multiple pagers and displays the Chinese service type function. 2It can also display the time and perpetual calendar in standby mode, and has 9 modes including voice announcement function. 3It can be received over long distances with 500 calling extensions. 4It is compatible with the fast bee full range of pagers, and the digital and Chinese service categories can be displayed simultaneously. 5It is mainly used in catering services, administrative offices, leisure and entertainment industries. Features: It has a number one to multiple pagers and displays the Chinese service type function.It can also display the time and perpetual calendar in standby mode, and has 9 modes including voice announcement function.It can be received over long distances with 500 calling extensions.It is compatible with the fast bee full range of pagers, and the digital and Chinese service categories can be displayed simultaneously.It is mainly used in catering services, administrative offices, leisure and entertainment industries.Specifications: Receiving Distance: 500m/19685.04inOf Open Space Working Voltage: 12V1A Power Supply Working Battery: 15-40ma Antenna Mode: External Antenna Working Frequency: 433MHz Receive Host Size: Approx. 23*16*3cm/9.06*6.3*1.18in Package List: 1 * K510 Host 1 * Receiver 1 * Power Adapter 1 * English Manual Note: Please allow 0-2cm/mm error due to manual measurement. Thanks for your understanding.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.