Feature:1. Each pager built-in rechargeable lithium battery, low power indicator and charging indicator2. Support learning code registration mode, you can easily add up to 999 pagers3. Have two remind mode of vibration and buzzer, each mode is accompanied by LED flashing4. Equipped with up to 20 battery charging slots, greatly improve the work efficiency and avoid the guest waiting in a long queue5. External antenna support about 1000 meters (3280ft) working distance in open area6. Widely used in fast food restaurants, food courts, pizzerias, churches, car shops or other places where many customers are waiting for serviceSpecification:Item Type: Wireless calling systemPager Frequency: 433MHzReceiving Sensitivity: -107dBmDecoder: Learning code (AM)Standby Current: 10mAWorking Current: 75mA (vibration)Menu Battery Capacity: Built-in 200mAh rechargeable lithium batteryKeyboard Call Button: Frequency: 433MHzStandby Current: 24 mATransmission Current: 100 mAKey Function: Power/Reset: Long press for 3 seconds to turn on/off; short press to reset to standbyCode Recording: Long press for 3 seconds to enter the code recording stateMode: Switch the remind mode, dial up for vibration mode; dial down for vibration + buzzer modeKeyboard: Press 0~9 digits to select the number you want to call: 1~999, then press the "call" key to call. If the wrong number is selected, press the "clear" key to reselect the number..Package List:1 x Keyboard Transmitter20 x Menu1 x Power Adapter1 x Antenna1 x User Manual