How many times you have placed your car’s keys somewhere in your house and wished you could have placed it at a proper place before. Happened with me many a times though and I always wished I would have some kind of transmitter-receiver thing to search the keys. Well, here is a solution for you.
A design concept by the name of Finder, is a little device for all of us who misplace essentials, like your phone or your keys. Finder is a two-part RFID Locator comprising of main transparent terminal and a series of small tab stickers. Basically you are supposed to stick the tracking stickers to objects that you tend to misplace often, like keys, phone, wallet etc. Configure the sticker with the appropriate label on the main terminal and you are set to use it.
Next time, when you have misplaced your keys, simply use this device to scan your room and it will point out your missing possessions and their approximate distances from where you stand.
I believe with innovations in Mobile technology, this feature might be integrated in mobile phones soon.
BTW: I hope at the end you do not misplace the finder itself.. 
[via:YankoDesign]