main features 1. 6 Unlock Ways: 3D Infrastructure Face, Fingerprint, Password, IC Card, Mechanical Key, APP (Real-time Intercom) 2. Carved alloy material built strong enough to protect your home; 3. Automatic lock and unlock with the latest automatic technology to free your hands; 4. Inside double lock knob gives you one more protection; 5. Emergency power supply in case of power loss; 6. Built-in rechargeable lithium battery. Low heating battery. One time full charge can work about 3 months. 7. English voice and menu 8. Check the unlock records in the lock 9. Infrared Sensor Camera makes it work well in dark environment as well. 10. Suitable for many types of doors: wooden door, stainless steel door, bronze door, double door, old security doors. 11. Left open and right open all compatible Indoor double lock knob gives you one more safeguard; Emergency power supply in case of lost power; Built in Rechargeable lithium battery. Low battery warming. One time full charge can work about 3 month. English Voice and menu Query unlock records in the lock Infrared Sensor Camera make it also can work well in dark environment Dear buyers! Welcome to my mall. If you are not sure whether this door lock is suitable for you, please