My Valver has one it was great when i find out that it had!
i pulled up at a petrol station and had both windows down as it was a hot day, i couldnt be bothered to put them up so i just thought i would just put the alarm on as i was only nipping in for a drink and was parked right in front of the window. When i got back to the car i noticed that the windows were shut, i said to my mate " did u put the windows up" to which he replied that he didnt, i was amazed that it had full closure thing on it, now i puposely leave my windows down, but my drivers side window motor is a bit fecked so sometimes it doesnt close it.
Its more of a toy than a necessity