Chipolo

Chipolo is a Bluetooth-based item finder for iPhone and Android platforms.

Chipolo is a Bluetooth enabled leash that wirelessly tethers to nearly any Bluetooth enabled mobile phone. It helps you find your stuff, whether it's lost or was just left somewhere. Chipolo isn’t just portable. It’s wearable, too. Clip it to your home or car keys, wallet, backpack, cat, dog - you name it.