Fix the Varna Rat Repellent within the engine area facing towards the bonnet.
Connect red wire clip to Positive and black wire to Negative terminal of the battery. The unit will start working, you will not hear any sound as it is in ultrasonic mode. You can press “TEST” button for audible mode, you will hear a noise.
You will get see desired results within 1 – 2 weeks, the rats will gradually stop visiting your car engine bay.