I fitted a Parking Dynamics http://www.parkingdynamics.co.uk/ rear kit
That was the sort of thing I was looking out for. I knew I had seen invisible ones in the past but I had no idea how it worked, what they where called or where to find them. Glad in a way that you say they are not that accurate I guess that is why 95% of the ones manufacturers fit are ultrasonic.
have you got a daylight rear picture to see what they look like from a distance?
do you find them useful?
No picture yet I'll get one up soon. Really I want to spray them a better yellow but it's hard knowing what will be a good match just by going by the top of the can, I don't want to buy loads just for the sake of finding one good one.
Usefull, hmmm I guess so. Like I said I never really had any issue parking or reversing the car before. Obviously they are not going to detect things to the side with their only being two of them but they do help a bit with letting you know how near you are getting to something directly behind.