Parking Sensor provides the perfect solution to parking your car with confidence. Parking Sensor uses ultrasonic waves to detect hard – to – see hazards; the warning alarm will alert you instantly to any hidden dangers. Is quick and easy to install – no wiring, drilling or soldering required. Eliminates the risk of damaging your car. Makes difficult manoeuvres easy Automatic switch off mechanism (after 20 minutes of no movement) Powered by AA batteries, or plug into cigarette lighter.