lisanne
Did you see the top gear episode where they moved Hammonds car? The key worked quite a distance away even though the "key" was in Hammonds pocket
Yeah that was hilarious, why the hell is my car in the middle of the road?!? haha
Thats why I dont think proximity would work, unless its swipe card type (IE, 1 inch proximity).
Button pressing or swipe card looks to be the better options IMO