After locking myself out of my house, I decided it was time to upgrade my locks to smart devices. I wanted a door lock that enabled fingerprint and PIN. The positive features of this lock are: *Fingerprint reader *Passcode PIN *Physical keys for backup *Backup power supply via USB ensures that it will not lock even if the batteries are empty (and it is the current USB-C, not micro socket ) *Smartphone APP , which can be very helpful in programming (multiple pin registration, fingerprints, temporary codes, auto lock, other functions). The installation instructions were good. The lock and door handle appear solid, without wobbling or play in movement, as was the case with other handles. The app works well and makes registering fingerprints and pins easier than programming with codes on the lock. The fingerprint reader works relatively well, but sometimes you have to hold your finger in place longer or move and reset it a few times to accept it. I wish it was a little better/more accurate, but it's not bad. Maybe try re-registering a different print (the same finger), which sometimes helps. Auto-locking occurs within a few seconds, which is safe but sometimes annoying (although you can change the setting if necessary). I've seen a few reviews saying the lock is worthless and any fingerprint can unlock it, which was a concern before purchasing. However, this is a security feature and is clearly stated in the instructions: If PINs and fingerprints are not registered correctly, each fingerprint can be activated to prevent you from being locked out. You MUST register these pins/fingerprints correctly before the lock can work! I can't currently say how long the batteries will last or how often the lock will be used, the auto lock mode etc makes any claim meaningless. Mine has been working for 2 months (with constant auto-lock) and unlocks multiple times a day with no problems so far. I like the door handle lock because of its color selection and fair price for the many features that all work well.