Hone

The Hone  for iPhone 4S and iPad3 will make sure you never lose your keys again. Using Bluetooth, the included app sends a signal to a device for your key chain that will light up and vibrate when triggered to point you in the right direction for your keys. The Hone includes a CR2032 battery that will last up to six months and the Bluetooth device will find your keys up to 164 feet away.