🔐3-in-1 Smart Door Handle: Combination Door Knob has 3 unlocking methods. 0.2s Biometric fingerprint quick unlock, can store up to 20 fingerprints for users. Keyboard password can store up to 15 sets of password users. (Need to slide the keyboard horizontally to activate the keyboard) In addition, equipped with two spare keys. | 🔐Easy Installation: This fingerprint Combination lock is applicable to most American standard doors. Adjustable Latch 2-3/8″(60mm) and 2-1/8″(70mm). The door thickness between (1.26~1.89inch). You only need a screwdriver to complete the installation in a few minutes. Please refer to the manual for details. | 🔐Intelligent security: This smart door lock is equipped with a backlit keyboard for use in low light. Low battery alarm, when the battery is low, the indicator light will turn red. Four new AAA batteries need to be replaced in time. Anti spy code encryption, to provide security for your room. | 🔐Quality Assurance: From the date of purchase, provide a one-year changed and lifelong technical support. | 🔐Versatility Smart Door Knob：Silent Mode: If you don't want to hear any sound feedback, you can turn on "Silent Mode". (*#7#) Passage Mode: If there are friends gathering at home, you can turn on "passage mode" so that any fingerprint can unlock the door. And the indicator of the fingerprint collector is pink.(*#6#)