Put Slim in tight spaces like your wallet, passport case or luggage tag and use our free app to find them. Keep track of more for less with our multi-packs or give them to your friends and family as a gift. - 200 ft. Bluetooth range - As thin as two credit cards - Up to 3-year built-in battery - Waterproof - Compatible with Android, Windows and iOS platforms - We do not sell data, nor do we use location data for marketing purposes Designed to fit your life. Our sleek finder helps keep track of important things.