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 SystemChannel: 999 channelsIndication mode: Vibration, bee cue, vibration + bee cueRound Receiver:Working frequency: 433.92MHzReceiving sensitivity: -107dBmCharging voltage: DC5VStandby current: 10mAWorking current: 75mA( vibration)Coder: Learning codes( AM)Keyboard Transmitter:Working voltage: DC5V/ 3AWorking frequency: 433.92MHzStandby current: 24mATransmitting current: 100mAAdapter: AC 100-240V 50/60HzConnection distance: Within 1kmCoder: Code learningBattery: Built-in 200mAh rechargeable lithium batteryPlug: US plug, UK plug, EU plug, AU plug for your choicePackage size: approx. 31 * 30.7 * 9 cm/ 12.2 * 12.1 * 3.5 inPackage weight: 1976g/ 69.7ozHow 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 numberWhen 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 * Transmitter20 * Receivers1 * Power Adapter1 * Antenna1 * 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.