Engaging the reverse gear activates the electronic control unit. At the same time this creates a protective zone around the bumper. An acoustic signal is emitted when any obstacle comes into the controlled area behind the car. The warning beeps get faster as the distance to the obstacle is reduced - so that a collision can be avoided. The Sanji PDC can be programmed at point of fit to accommodate vehicles that have a stationary object in front of the bumper / fender, like a tow bar or a spare tyre, so that it would not activate the signal and would have no influence on the normal operation of the device. The Sanji PDC system can be fitted to any car with perfect colour coding to match the vehicles bumper.