About this item 3 in 1 SMART DOOR LOCKSmart door lock has a fingerprint unlocking, APP unlocking, key unlocking three unlocking methods, is a 3 in 1 perfect fingerprint smart door lock smart door handle INTELLIGENT LIFEA key fingerprint door lock supports APP control, check the unlocking record through APP, more secure unlocking, semiconductor fingerprint sensor allows you to quickly access fingerprint management, up to 20 fingerprints, intelligent security technology will guard you and your family's safety EASY INSTALLATIONThe smart door handle door lock can be easily installed in minutes with a screwdriver, we have detailed installation instructions, very easy to install, fits most US doors, meets your every need! PREMIUM DESIGN & HIGH QUALITY MATERIALBiometric door lock is made of high quality aluminum alloy material, it is clear, smooth and easy to clean, and with classic door handle design, it also adds fingerprint lock and APP unlock function, it is the ideal choice of smart door lock for bedroom door, office, hotel, apartment! NOTEThe smart door lock is suitable for wooden doors between 30-55mm, fire doors, security doors, etc. 4 AAA batteries are required for installation, when you low battery mode after the USB interface can also be used for emergency power supply, but please note that do not charge, replace the batteries again Package includes: 1* Door Lock If there are other problems feel free to consult us!