This wireless queue calling system adopts 999 channels keyboard and 20 pieces of pagers to improve the working efficiency to a great extent and avoid the waiting of the client in the long queue. Built-in antenna spreads the work distance to about 1km. Furthermore, 3 indication modes of vibration, bee cue, and vibration + bee cue make it suitable for different situations. Features: 1-for-20/ 999 Channels - A 999 channels base and 20 pieces of pagers help avoid the waiting of the client in the long queue to a great extent. Built-in Antenna - A built-in antenna creates a high sensitivity to enable base to call pagers clearly and correctly. 1km Connection Distance - A built-in antenna enables pager to work normally within 1km from the base. 3 Indication Modes - Adopting 3 indication modes of vibration, bee cue, and vibration + bee cue to make it suitable for different situations. Wide Compatibility - Suitable for places where there are many guests waiting for service. Specification: Product type: Wireless Queue Calling System Channel: 999 channels Indication mode: Vibration, bee cue, vibration + bee cue Round Receiver: Working frequency: 433.92MHz Receiving sensitivity: -107dBm Standby current: 10mA Working current: 75mA( vibration) Coder: Learning codes( AM) Keyboard Transmitter: Working frequency: 433.92MHz Standby current: 24mA Transmitting current: 100mA Connection distance: Within 1km Coder: Code learning Battery: Built-in 200mAh rechargeable lithium battery Package size: approx. 31 * 30.7 * 9 cm/ 12.2 * 12.1 * 3.5 in Package weight: 1976g/ 69.7oz How to use: Guests come to the restaurant to order. The waiter gives each guest a pager; each pager has a number and write down the number When the order is ready, the waiter at the counter will press the number on the transmitter. The corresponding guest obtains a wireless signal through his pager vibrating or LED flashing or sounding, and then he knows that the order is ready and goes to the counter to get his food. Package List: 1 * Transmitter 20 * Receivers 1 * Power Adapter 1 * Antenna 1 * English User Manual . Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.