Features:Wide application: perfectly used for doors, cabinets, bikes, backpacks, storage lockers, etc.Free APP unlock: keyless convenience helps you get rid of worrying about lost keys or forgotten combinations(suitable for Android and IOS system).Great flexibility: one lock can be authorized to multiple users and a user can unlock multiple locks.Easily monitor activity: including unlocking record and sharing record.Superior strength and practability: made of aluminum alloy body and stainless steel latch hook.IP65 waterproof: high waterproof grade allows outdoor application.Replaceable battery: built-in CR2025 battery, it provides about 1000 unlock times, longer battery life.