4 unlocking modes: fingerprint, app, code and key. In any case, you can choose the best unlocking . [App Management]Up to 100 and 100 passwords, and record unlocking time (view in the app). You can know if your family is safe . The application records the time and date they use the password; [Illegal input reminder function] For some behaviors that do not have a password but are intended to be entered, the system will enter the wrong password or fingerprint 3 times in a row and send a reminder in the app; [Normally Open]There is a button on the back of the lock, which can be pressed and for 1 second to turn on or off the access mode. When you need to frequently enter and exit the door, you can use this mode to temporarily change the lock to a mechanical lock; size: About 16cm long Material: Aluminum alloy colour: Black Package Contents: 1 x fingerprint door handle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.