Well, what can I say, it definately works!!! Going to work this morning in my new "Van" and off goes the red dash warning letting me know something is amiss. It was dark but luckily I was only a few humdred yards into my trip so I went home and with torch I found a 1 1/2" wood screw in the outer part of the tread. Put some water+washing up liquid over it and it barely bubbled so the electronics must be very sensitive. Now, is it me or does any one else always suspect vindictive vandalism when ever you get a puncture? Seriousley, I always rush to assume that some scuffer has had a go whenever this happens. I dont know why but I had a bad feeling about yesterday and especially last night, like as if something bad was going to happen which I suppose it has, 215x45 17" GoodYear Exellium? that will be £185 fitted sir!!!!! Portzy.