Features: 1. Improve work efficiencyand enhances the restaurant'for image;Minimize crowds in waiting line and Reduce staff chaos ;Notify people faste and Reduce staff chaos & improve ambience. 2.20 channels base and 20 pieces of pagers help avoid the waiting of the client in the long queue to a great extent. 3.1km Long Connection Distance. A built-in antenna enables pager to work normally within 1km from the base 4.3 Indication Modes. Adopting 3 indication modes of vibration, bee cue, and vibration plus bee cue to make it suitable for different situations. 5.Widely used in various commercial situations such as restaurant, cafe, milk tea shop and etc. Specifications: Material: ABS Color: Black Plug Type: AU Plug; EU Plug; UK Plug; US Plug Connection distance: Within 1km Channel: 999 Channels Indication Mode: Vibration/Bee cue/Vibration&Bee cue Round Receiver: Working frequency: 433.92MHz Receiving sensitivity: -107dBm Charging voltage: DC5V Standby current: 10mA Working current: 75mA( vibration) Coder: Learning codes( AM) Keyboard Transmitter: Working voltage: DC5V/ 6A Working frequency: 433.92MHz Standby current: 24mA Transmitting current: 100mA Adapter: AC 100-240V 50/60Hz Size: Approx. 15x30x3.3cm/5.91x11.81x1.3in Weight: Approx. 1600g Package Includes: 1 Piece Transmitter 20 Pieces Receivers 1 Piece Power Adapter 1 Piece Antenna note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!