Control Access: Grant access, and revoke them again whenever you need to. It’s up to you. Never worry about lost, stolen or copied keys again Smart Reminder: digital door lock will remind you to replace the battery. if worried about forgetting to replace the batteries, fingerprint keypad door lock enables connecting an external power bank for emergency power supply; also low battery indication will notify you when the batteries are getting low Keeping Home Safe: 3-in-1 Keyless Entry Digital Door Lock: Passcode + MIFARE M1 Card + Emergency Key, Smart Lock Front Door, After somebody enter incorrect passcode 6 times, this digital door lock will be automatically locked for 1 minute and anti peep pass code support; Longer Lifespan & More Reliable: Both the front and back panel of this Smart Digital Door Locks are made of Zinc Alloy, Anti-impact & suitable for harsh environments. ( Waterproof Level: IP65; Operating Temp Range: -20℃～70℃ ), 30-day money back guarantee, 1-year product warranty and a lifetime customer support following the date of purchase. EASY INSTALLATION: All it need is just a small screwdriver, about 15 minutes you can install a smart digital door lock for your home or office. Compatible with exterior doors where keyed entry & Fits most standard residential door (the door thickness of 1.3 inch to 2.04 inch)