Cant find your keys? Give them a call!
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How about an electronic device which is attached like a keyring with your keys. It will have a sensor. It will send signals and receive signals. If you have lost your keys you could dial (on your mobile phone) a personal signal number that would transmit to the keyring, causing an alarm to be set off! Or if you lose your phone you could press the keyring button which will activate the alarm on the phone. With a flashlite attached to the keyring as well this could be a handy object.