This great product means that you can now reverse with complete confidence & peace of mind. The Parking Sensor fixes to your bumper with no drilling, soldering or wiring. The small, sleek unit plugs into your cigarette holder (or takes 3 AAA batteries- not included) & warns you with a low beeping noise if you are too close to another vehicle, wall, or obstacle. The beeping increases in frequency as you get closer to the object behind you. It is easy to install or remove without damaging the car. This can be very useful for learner drivers or those who lack confidence with reversing!