Parking Sensors installed on a Mondeo
This 67 reg Ford Mondeo was fitted with a Dolphin Automotive DMS400 micro sensor kit in "muddy grey". I think you will agree a great match at a great price.
The DMS400 kit comes with an audio buzzer which alerts at a more frequest rate the closer you get to an obstacle. The beep becomes continuous at a distance of 30cm to alert the driver to stop reversing.