ZKTeco Password and Fingerprint Door Lock Smart Keyless Entry Lockset Interior THREE WAYS TO UNLOCK: Fingerprint, password and mechanical key. L7000-U is an electronic lock which supports up to 500 fingerprints.(Suggest Operation Temperature:&gt;=32); For Installation Guide and Instruction, please search ZKTeco L7000on Youtube 128*64 1.54" OLED DISPLAY: Easily Add or Delete user information on device. It shows unlocking records, enrolled user quantity and battery level. A 24/7 ACTIVITY LOG TRACKS: Visitor ID trackable (know whom and when visit your place). The latest 30000 unlocking records can be tracked. Users can browse unlocking records on device. NORMAL OPEN MODE: Stay unlocking whenever you want. Just press the handle to open the door. USER DATA BACKUP: Uploading/downloading of user information through USB flash disk. All the data can be copied and stored, which means you do not have to worry about losing User information anymore.NOTE: This Lock is not waterproof and it's only for indoor use. 2 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 Suggest operating temperature is &gt;=32,The cold temperature might effect the sensitivity of the fingerprint scanner <span class="a-text-bold">NOTE:</span> This Lock is not waterproof and it&#039;s only for indoor use. <span class="a-text-bold">NOTE: </span>It is not recommended to use in environments below 0 degrees.    It is not recommended to use in environments below 0 degrees. New generation fingerprint recognition algorithm Idle handle design to prevent from forcible entry OLED display screen with visual menu Smart alarm for low battery &amp; illegal operation Normal open mode Support query door open logs Backset is adjustable (60mm or 70mm) Material:Zinc Alloy Fingerprint Capacity:500 Password Capacity:100 Log Capacity:30,000 Operating Temperature:32 F ~ 122 F(0C ~ 50C) Communication:USB flash disk Power Supply:4  AA Alkaline Battery Backup Unlock:Mechanical Key &amp; 9V Battery Door Thickness:35-55 mm (standard),55-75 mm (optional)