This device is Access Control System. It has USB transmitter and wireless receiver. Connect the USB transmitter to the interface of your car and connect the wireless receiver to your auto gate opener. The door will 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 will be open automatically within 10 meters. The door will close automatically after the car enter into the gate if the gate motor has automatic close function. Working voltage for receiver:AC/DC 12-24V, Working current for receiver:18mA2 How to code the USB sticker into the receiver: 1. Learning code: Press the button P1 once in the receiver then the USB sticker will be code into the receiver once supplying the power to it.The LED will flash twice if code successfully.Press 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 will 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 will 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 will close after 10s once disconnecting the power to the USB plug. Or the gate will close automatically when the car is not in the detect distance. Channel:2-CH Frequency:2.4G Working voltage for USB plu:DC 5V Working current for for USB plug:1mA0.5 Memory number of USB plug:340pcs Distance:10m when the USB plug insert into the car Colour:Black Material:Plastic Package Contents: 1 * Garage Door Opening Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.