With this system, your phone finds your lost keys and your keys find your lost phone. Get it here for $120. GENIUS
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. YES!!! Someone buy this for me as a present, please?!?!
Never Lose Keys in The Lake!