Features 1??Each pager keeps built-in rechargeable lithium battery with low battery indicator and charging indicator. 2??3 prompt modes means that vibration / buzzer / vibration + buzzer while each mode is accompanied by LED flashing. There are 20 battery charging slots. 3??Built-in external antenna supports working distance in open area is about 1000 meters (3280 feet). 4??Button function helps that long press for 3 seconds to switch the machine and short press to reset to standby. 5??Coding recording set is that short press to enter the coding recording state and long press for 5 seconds to clear the coding. 6??Mode supports to switch the prompt mode of vibration / buzzer / vibration + buzzer three modes. 7??20-channel call keyboard, directly press the corresponding number, you can directly send the signal. 8??The wireless queuing system includes a 20-channel keyboard wireless call button base and 20 menu picking cards. 20 different codes can be transmitted via keyboard buttons. 9??Queuing system greatly improves work efficiency and prevents clients from waiting in a long queue. 10??So widely used in fast food restaurants, food courts, pizzerias, churches and auto shops or other places where many customers are waiting for service. Specification Item Type: Restaurant pager Model: SU-68G Menu Picking Card: Working Frequency: 433MHZ Standby Current: 10??5mA Working Current: 75??10mA (vibration) Receiving Sensitivity: -107??2dBm Battery Capacity: 200mAh Decoder: Learning Coding (AM) Size: Approx. 49 x 101 x 11mm / 1.9 x 4 x 0.4in 20-Way Keyboard Host: Working Frequency: 433.92MHz Standby Current: 24??5mA Sending Current: 100??30mA Encoder: Learning Coding(AM) Package List 1 x 20-Channel Keyboard Host 20 x Menu Picking Card 1 x Antenna 1 x Power Adapter 1 x User Manual