[Smart Fingerprint Biometric Recognition] The fingerprint door lock is equipped with an upgraded version of 508 DPI fingerprint sensor module, effective pixels 120 X 120, 0.5 seconds recognition rate of more than 98%. It is faster and more convenient than using traditional keys, and more secure through your own unique biometric identification. [Easy DIY installation] Suitable for most standard single-cylinder American doors. It takes only a few minutes to complete a simple installation with a screwdriver (included), without additional drilling. Universally suitable for door thicknesses from 1-3/8" (35mm) to 2-3/16" (55mm), adjustable latches are 2-3/8" (60mm) or 2-3/4" (70mm). Please check your door size before buying. If you still have any questions, please follow our video. [User-friendly features] We want our keyless entry door locks to be worry-free. Our lock stores 30 sets of fingerprints, of which the first fingerprint serves as the administrator role. Our door lock handle can be configured to open the door on the left or right. The door lock has an automatic locking function and a normally open mode. With these features, the lock is suitable for various scenarios, such as bedrooms, Airbnb, hotels, offices, storage rooms, etc. [Low power consumption] Our door lock uses 4 AAA alkaline batteries, which can be used for about 1 year. (4 AAA batteries are not included) When the battery is almost used up, the red LED will flash 5 times to remind you to replace the battery. In addition, we also provide a micro USB cable as an emergency power supply to unlock the door, in case your power is completely exhausted.