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Digital Doorlock Zinc Alloy. 1.5 ways to unlock methods: APP Remote Control WIFI Remote control with no limit on distance Fingerprints Both Front and back can be unlocked with fingerprints Passwords Temporary Password/Permanent Password IC Smart Cards Mechanical key Unlock. 2. Support doorbell function, indoor close/open button, indoor close/open knob. 3. Intelligent induction automatic Recognition of left and right opening, Glass door Thickness is 10-12mm, Door gap is 4-15mm. 4. Normal power supply mode, Low power consumption and long-lasting endurance of 4 No. 5 alkaline batteries. 5. Multifunctional smart lock makes life safer and more comfortable for front door/office door/sunroom/studio door