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Transponder keys

I have a lost transponder key in the house.

Is ther a device which I cn use to find it.

Since my car can recognise it from a few feet away, it stands to reason the technology exists to have such a device.

Short answer: No.

Long answer: You could probably get someone to make you one, but you’d spend enough to buy several hundred (at least) replacement transponders.

They do make a keychain that responds to hand clapping by beeping. But you’d have to find your transponder key first in order to attach it to the keychain.