?After-Sales Support?Worry-Free 30 hassle-free return policy and 24-hour technical support by email or by phone. Please feel free to contact us if you have any problem. Before installing, please scan the QR codes in the user manual to watch the installation video. ?WarmTips?The smart biometric door handle requires 4 AAA batteries (not included), has low battery reminder function; Equipped with a USB interface for emergency charging port.(Note: The interface is use for emergency charging unlock). ?Easy Installation With 2 Screws?The smart door lock is made of aluminum alloy, Security and durable. It fits most of US standard door, No wiring and no drilling, easily install just with a screwdriver. Fit both left handed and right handed doors. A perfect smart lock for bedroom door, office, apartments, AirBnB, hotels. ? Secure and Smart Function? Exclusive features: Luminous function, make you easily find the lock at dark night. Passage Mode: Easily set and you can get in and out freely when turn on the mode. Security Mode: Creat a Private Space, no disturb just focus on your own. Voice prompt function: when at night, you can turn it off and create a super quiet sleeping space. ?Fingerprint Unlock+Back-up Keys?The fingerprint door lock smart door handle, using advanced semiconductor biometric door lock fingerprints identification technology, only need 0.2S to unlock the door, rounded ergonomically and made it one touch unlock in 360 degrees. Including 20 Pcs fingerprint storage, very nice keyless entry door lock with handle for a whole faiily to achieve keyless access. Also have 2 back-up keys for back-up for options.