This kit features 4 sensors at the rear and colour coded where applicable (Coach Built Motorhomes only)
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As soon as reverse gear is selected, the ultrasonic sensors installed in the rear bumper are activated and detect any obstacles behind the vehicle. The driver is alerted by an audible buzzer that gradually intensifies as the obstacle approaches, becoming continuous within 30cm.
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The price of £399 includes VAT and is for the "sliding door" vehicles as displayed in our pictures. 
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If you would like an independant switch fitted at the rear of the vehicle to disable the rear audible buzzer, this is an additional £79 including VAT (this is for vehicles with towbars, bike racks, vehicle towing).