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With this system, your phone finds your lost keys and your keys find your lost phone. Get it here for $120. GENIUS
Dots that Let You Find Things with Your Phone -- now, if I can just find my phone.....
Cobra tag--use your phone to find your lost keys, use your keys to ring your lost phone (even if the ringer is turned off) and use an app to keep a map of places you find you lost stuff to help you keep track of it. Very cool.