This kit features 4 sensors at the rear and comes with an audible buzzer with volume control.
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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. 
The price of £499 includes VAT and is for all coach-built motorhomes and includes colour coding where applicable.
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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).