KPP Fingerprint Door Lock, Smart Lock Biometric Keyless Entry Door Knobs Door Handle for Bedroom Door Lock, Apartment and Office(Silver), Minimalist fingerprint door lock: KPP keyless entry door devotes to researching and applying on fingerprint technology, fingerprint unlock and auto-lock leads your life to a new and convenient lifestyle., Two modes of unlocking: Fingerprint and emgency key, after enrolling your fingerprint, biometrics technology with 98% recognition rate helps you never carry the key to go out, two mechanical keys just work as emgency key or reserve key., Low energy power supply: It needs 4 pcs AAA alkaline batteries, works about 1 year,when it runs out, red light will flash to remind you to change battery, there is a USB interface for you to charge with USB cable to unlock as emergency charging, so never care about batteries runs out., Standard door locks size: Fits for most standard residential door, applicable door thickness between 35mm to 55mm (1.4 to 2.2 in)and the adjustable deadbolt mortise 60mm to 70mm (2.36"" to 2.75""). Check your door size before order., Simplistic design change your life: This fingerprint lock is as smart as it is elegant, providing your room with an added level of safety without announcing it to the world. With a soft unlocking motion, it is ideal for inner doors of residential, apartment or other private spaces., ,