I think they should have a greater range. Ours were fitted when the car was bought new in 2008 (pre-facelift). The "beeps" start at around 1 metre and increase in frequency as the object gets nearer. At 30cm, it should become a constant beep to signify that you are about to hit something, considering the spare wheel protrude outward a fair bit on the RAV. Ours are genuine Toyota accessory. I know some dealer fits aftermarket ones (some of them a little fancier with distance readout LED screens inside etc). The sensors were fitted prior to delivery of the new vehicle last week so I assume they are genuine. I will speak to them when I get the first service. I reversed up to my garage door and the first beep was at about 30 cm then it became constant within a very short distance. As stated with the spare wheel and tow bar this does not leave much room for error. Thanks for your quick reply :)