Key sensor

Most of the time i forget whr i keep my cell phone especially my room keys and later face trouble in finding them.For cell we can ask our friends to give missed call and find it but for things like my specticles ,keys it takes hours to find them at times.So I always think there should be some way like a small sensor attached to it and we should be able to find it whr ever it is....but the most important thing involved is cost ...since we can't invest hundreds and thousands on keys likes stuff which costs us only few bucks we need to consider the feasiblity of the method.not only this even  the size is imp..i am thinking of a small ticker type thing which we can stick to its surface.I will post more information regarding this soon
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