Access the smart digital door lock : 1) Fingerprint (up to 200 sets) 2) Code / Password (up to 50 sets) 3) RF Tag (up to 100 units, included 2 units per lock) 4) Mechanical key (included 2 keys per lock) Enhanced Safety Function: 1. Master code function - Change any function must input the master code first and then go to next step. 2. Break in / Damage alarm - The lock will sound if the intruder attempt to force open the lock. 3. Wrong-try lock out - Lock stops operating for 3 minutes with 5 invalid code attempts. 4. Low voltage warning - The lock will sound when the battery power is running low. 5. Emergency power supply - Used the power bank by Micro USB interface to re-working the lock. 6. Garbled function - Continuous input any code, as long as correct code been included and then input "#", the lock be open. 7. Voice guide - Voice guide will walk you through the whole process. You can simply use the touchscreen to add and delete user on the device. 8. OLED display and Door Bell installed. Specification as below : - The Smart Digital Door Lock size: Outer body (L. x W. x D.) : 23.2cm x 7.2cm x 7.3cm Inner body (L. x W. x D.) : 23.2cm x 7.2cm x 7.3cm - Suitable for door thickness : 35mm ~ 60mm - Backset : Small mortise : 60mm / Tubular latch : 60mm / 70mm - Power : DC 6V AA (LR6) Alkaline batteries x 4 pieces - Package : Carton box dimensions : 70cm x 30cm x 10cm Weight : 2.20KG.