I was parked next to a Mitsubishi Montero. I tried to lock my car while standing less than a foot behind my car. It would not work. I had to stand right beside the driver's door before it would work. After the Montero left, it worked fine. Very strange.
k, it has nothing to do with opening your mouth. touhcing it to your chin.. maybe.. but opening your mouth? think about it...just think of logic... please.
Your right, it is better explained as touch your chin.
And yes it can almost double remote transmitters range.
I played around with it one day and found I got an extra few feet from also opeinig my mouth, wierd but cool.