"It’s about pressing a button on your keyfob to find out where you parked your car"
Which can, occasionally (OK once!) be useful. When you attend a gig at a large outside venue where parking is in a selection of unlit fields, none of which are signposted, the only way to find you car can be wandering around the field pressing the keyfob until something beeps at you.
Sometimes it's even the right car.. (and I apologise to the strangers who, apparently, had the same keyfob code as me..).
(It was Genesis, Leeds Roundhay Park in 1992. A great concert only spoilt by the shoehorning of Lisa Stansfield into the setlist.. - Runrig and Genesis were great).