The Steelmate parking sensor kit comprises of 4 sensors with audible alert only.  The system can be programmed to ignore tow bars or spare wheels and comes with 3 years warranty. The sensor hole size is 18.8mm in diameter. The visible external diameter of the sensor head is 24.9mm with a depth of 21.51mm and they have detachable cables and a 6 degree angle of tilt.

Main Features:

4 sensors for full rear coverage
4-stage audible warning buzzer
Heavy rain proof design
All weather design (-40°C>+80°C)