Price: £99.99 (plus £4.99 p&p) Sensors/alerts: Four/audible & display

Left and right countdown bar graphs are shown on a small display, changing from yellow to red as the car nears the object behind. Because it receives wireless signals directly from the sensors, there is no wire to run through the vehicle, although a power feed is needed. It picked up the hose sporadically from 1.3m, and got to grips with it properly at 90cm.