ZKTeco TL100 Fingerprint Biometric and Touchscreen Keypad Keyless RFID Smart Door Lock+5pcs RFID Cards, Right Handed Four ways to unlock: fingerprint, user code/password, ID card,mechanical key. Support up to 100 fingerprints and 100 ID cards(Suggest Operating Temperature:&gt;=32) FIT DOORS:Backset 2.16(55mm),Door thickness between 1.18(30mm) and 2.16(55mm),We suggest ask Locksmith to install this lock.Installation Video :Search ZKTeco TL100 on YouTube NOT REVERSIBLE: Be careful when choose the left or right handle lever. Installation Video:Search ZKTeco TL100 on YouTube User date synchronization;The user date can be download /upload via U-disk from one lock to other locks,it will help user to save time in some repeated registrations. Idle handle design to prevent from forcible entry.Turn handle upward to lock deadbolt.Smart alarm for low battery.Voice guide for easier and more convenient use 6 holes need to be drilled while the lock is installed. So it wouldn&#039;t be a good choice if your door can not be drilled Please use ALKALINE BATTERY only The mortise hole needs to be drilled wider based on America standard mortise hole Please confirm your door open direction before purchase.This item is for right open direction. Suggest operating temperature is &gt;=32,The cold temperature might effect the sensitivity of the fingerprint scanner