Hippih unveiled the Hipkey, a kind of digital leash between your iPhone and a sleek, small Bluetooth 4.0 device that's the size of a large coin and fits on your keychain. You can use Hipkey and its free iOS app to find your phone or vice versa. If either moves out of range, Hipkey triggers audio and vibration alarms. Via Bluetooth, it pairs automatically with your iPhone. You can set the range to short (2-5m), medium (15-20m) or long (30-50m). On sale via Apple Store in U.S. Jan. 15; price in U.K. currently $112.