1. Get a auto service for installation at a garage or operate by technicist.
2. Park your car and turn off the engine. Open the hood of your vehicle, and find automotive battery.
3. Turn on the power and turn on the switch, link the two connectors with the battery, black lead to cathode(-), red lead to anode(+).
4. A red LED and white light will remain for 3 seconds to indicate the unit is working properly.
5. Place the repeller with right side up, so that ultrasound can cover the engine compartment.
6. Keep the repeller from dust, and humid environment.
7. When there is a vibration signal trigger circuit (vehicles start), red light flashes,the unit will stop working. 90 seconds after vibration signal stops (vehicles stop), it will work again.