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Do you ever faced dilemma cant go out when you couldt found the key ? I trouble in it always, but, An accidental chance, I got an inspiration from call flash, (it is a mobile chain, flash when incoming telegram), then design a key chain by mobile to found the key. Its using principle is similar to call flash , it would ringed when received a special mobile signal (it must be special signal or it will ring continuously)，then you can find it easy. Is it sounds good?