The fingerprint lock is made of zinc alloy, whether the padlock body or shackle. High toughness steel wire, seamless joint is great for anti- thief, anti-dust and anti-erosion. This lock is your best choice to protect your private property from thieves. Quick unlock in 0.5 seconds. It can collect 2 administrators and up to 10 fingerprints in total. One hour for full charge, it can unlock more than 9,000 times. That means 6-12 months you don’t need to worry about the battery.