If you always forget where you put your keys … this innovative idea will help you:

Cobra Tag is a small device ($60) made to put your keys in or to put it in your bag or anything that you afraid to loss ,this device is connected to a free cell phone program to tell you exactly where it is .
through this tiny device , you can find your phone (if you lose the phone itself) through pressing a button which will make the phone release a tone till you find it!!
if you lose them both ,  in this case i think there is no technology will help you