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By david_delourdes
Just like we can call our cell phone if we misplace it (of course utilizing another phone to do so.). What if your phone could be programmed, to have an option in the menu screen that would allow you to send a radio/bluetooth signal to a key chain on your keys so they can be found.
By nphawat
whethe the cell phone the keys or a pet... they can be tagged using RFID (radio frequency identificatoin) and you can gain acess to the location by any mean whether thru phone menu the pc or just by callping ur hand twice the cell phone will ring if you wave your hand the key chain will beep etc.... and it's already being done on humans two.

for more scientific approach you can go through.
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