Price: £59.99 (plus £4.99 p&p) Sensors/alert: Three/audible

As with the Targa system, the AVRS1NP attaches to the number plate. However, this is a single plastic strip with three sensors – one central and another at each end. And due to the thick central cable, it probably requires drilling to fit. The parked car and bollard were detected well, but it didn’t reliably find the hose reel until only 50cm away.