Simple picture guide to install Varna Ultrasonic Rat Repellent for X-Trail Nissan car.
Face the Varna rat repellent facing towards the bonnet hood to reflect the sound throughout the engine bay. If your car has insulation foam within the hood, you may have to stick aluminium sticker to reflect the sound 100%.
Connect the red wire to positive terminal of the battery and black wire to negative terminal of the battery. The unit will be functional, you can see red light flickering.