KF1 Remote Key finder

Frequency: 433.92MHZ
Sound: 75DB
Card size:8.4X5.5X0.38CM
WT:15.5g (battery included)
Battery:Lithium CR2016 2pcs
Keychain size: 4.5X2.8X1.1CM
WT:13.5g(battery included)
Battery:CR2032 1pc
Battery last: 12 months

Put the card in the wallet, and the keychain tie with the keys, when you can't find the keys, just push a button on the card, and the keychain will sound alarm within 1 second.
The alarm will last for 5 seconds, and then stop.
Working distance: 25-40meters.