... walls and floors(great ability to find your keys even if hidden inside drawers, cabinets, pockets, ... any other hard to find place), finds lost keys quickly2.Zero false alarms3.Credit card shaped transmitter fits ... 8*10.7*2.8cmWhere are my keys?1)Tired of losing your keys all the time? Getting stressed ... sensitive receiver will help you find your lost keys behind walls, inside drawers, under bedding and ...