With this key fob, if you misplace your keys, your Bluetooth Low Energy-compatible iPhone or Android smartphone can find it. Using Bluetooth’s roughly 100-foot range, the mobile device can send a signal to this key fob to ring an alarm and lead you to the missing item.
OK, other Bluetooth key fobs can do the same. But the Keylink also works in reverse: Press its button to have your smartphone ring out its location, in case you misplaced the phone but have the key fob.
If you have a compatible Android smartphone running the new Lollipop OS, you can set the fob as a trusted device, which automatically unlocks your device when in range of the fob. That makes it easier to use your phone but lets password protection do what it's supposed to: keep other people out.
The Motorola Keylink costs $25.