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Apple AirTag
$24
Local · Cloud-dependent
Lost keys, found people.

By Apple.
A Bluetooth tracker that borrows every iPhone nearby to report where it is. Very good at finding keys. Also good at finding people who did not ask to be found.
We do not link to the smart one. You can find it.
The dumb one is the Brass goose wall hook.
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Electricity has never helped anyone find their keys.