Main Feature 1. 5 unlock ways: Fingerprint, Password, IC Card, Mechanical Key ,APP 2. Carved alloy Material Built Strong enough to protect your home; 3. Locking & Unlocking automatically with the newest automatic technology to free your hands; 4. Indoor double lock knob gives you one more safeguard; 5. Emergency power supply in case of lost power; 6. Built in Rechargeable lithium battery. Low battery warming. One time full charge can work about 3 month. 7. English Voice and menu 8. Query unlock records in the lock 9. Infrared Sensor Camera make it also can work well in dark environment 10. Suit for Lots of door type: Wooden door, stainless steel door, bronze door, Double door, Old-fashioned security doors 11. Left Open and Right Open All compatible 12. Monitor function, send photo to mobile App Battery purchase connectionTo purchase a battery, click on the image to jump to the purchase page.