Come and see our amazing products. NO app,NO key,NO bluetooth.your finger is the key which discourages the thief to crack the code.Do not worry about losing the key or the password is known to the thief,Please note:Any skin contact can open the lock in the factory mode,Please enter the administrator's fingerprint according to Installation before using.The fingerprint lock is made of zinc alloy,whether the padlock body or shackle.Gym lock is your best choice to protect your private property from thieves,The fingerprint lock is small and classic,just 90g,3*1.8*0.51in.The lock locker adopts the advanced fingerprint identification chip ,Quick unlock in 0.5 seconds.It can collect 2 administrators and up to 10 fingerprints total,easy to use.2 hour for full charge,it can unlock more than 3,000 times. Pls confirm further with us if any query about packing info, inventory status and time schedule.