75DB 433.92MHZ KF4 Remote Electronic Key finder with Lithium
WT:21g (battery included)
Put the card in the wallet, on the desk or stick it on the fridge.
and the receiver with keys, when you can't find the keys, just push
a button on the card, and the receiver will sound alarm within 1
The alarm will last for 5 seconds then stopped.
Working distance: 25-40meters.