Fingerprint Door Lock, Smart Door Lock, Biometric Keyless Entry Door Handle for Home Apartments Office Hotel Bedroom, Suitable for Left Handed and Right Handed Door, Black, ??3-in-1 Versatile Lock: APP unlocking, Fingerprint unlocking, Backup mechanical key. Press the fingerprint to unlock in one step. Perfect fits for most standard inner residential and office door, ??Smart App Control: App/Software is free to use forever. No hidden charges or long-term costs, ??Energy Saving Long Standby : 4*AAA batteries support unlock about 6000 times(up to 10-12 months) with low power consumption. Automatic alarm for low battery., ??Easy to Install : Fit for most standard door and both fit left & right handed doors. Door thickness range: 1.38 inch to 2inch thick. Backset:?Adjustable 2.38"" (60mm) or 2.75"" (70mm). Only need a screwdriver to easily complete the installation. Easy to replaces existing deadbolt and latch, ??Tips : The lock is default Right-hand open direction. If you need to change to Left-hand open direction, please refer to the part starting from 3'35 in the "" Install step by step "" video., ,