This device is Access Control System. It has USB mitter and wireless receiver. Connect the USB mitter to the interface of your car and connect the wireless receiver to your auto gate opener. The door be auto opened when your car heads for the door. It is hand-free and you don't need extra remote control or smartphone to control the door. Applications: This receiver and USB plug can be used for sliding gate motor, swimming gate motor , garage door and boom barrier. People can install the receiver into their gate motor, and match the code for the receiver and the USB plug. When people drive their car with USB plug inserted into the charging port, the door be open automatically within 10 meters. The door close automatically after the car enter into the gate if the gate motor has automatic close function. Working voltage for receiver: 12-24V, Working current for receiver:18mA±2<br><br>How to code the USB sticker into the receiver: 1. Learning code: the button P1 once in the receiver then the USB sticker be code into the receiver once supplying the power to it.The LED flash twice if code successfully. the button again to exit learning mode or recode if failed to code.Each receiver can code 340 USB plug at most. 2. Delete code: Hold button P1 5s,all the code be deleted once the LED flashes five time and then release the button. How to connect wire and control the gate: The yellow line and white line are for the first channel. The blue line and green line are for the second channel. When supplying the power to the USB plug, the first channel be on and door open. If the gate motor has automatic close function,you do not need to use the second channel.If the gate motor does not have automatic close function,you can connect the second channel and the door close after 10s once disconnecting the power to the USB plug. Or the gate close automatically when the car is not in the detect distance. Channel:2-CH