You can't locate your car in the parking lot or parking garage. And you just want to go home after the game/concert/court appearance. And you keep clicking on your key fob, but you must be too far away from your truck/car for the lights to flash. If only you could extend the range of your key fob.

Perhaps I (and Professor Roger Bowley of the University of Nottingham) can help. He heard about this on the BBC TV show "Top Gear" - but he demonstrates how and WHY it works here.

All you need is a brain. Or a water bottle. Hopefully you have one of the two handy next time you're in the parking lot.