??【Easy Installation】 KUCACCI keypad door lock with handle replaces your existing door lever or door knob on standard door easily with just one Philips screwdriver. No Drills Needed. No Locksmith Needed. Equipped with professional instructions and videos to complete the self-installation within 5 minutes. ??【Double Assurance】With a low battery, this smart lock for front door will initiate a low battery alarm and there are 50 times maximum to unlock. When the battery is powered off, use the backup key or micro USB power bank to open the digital door lock. Never be locked out. ??【Excellent Customer Service】KUCACCI smart lock provides 1-year warranty and free life-time technical support for your smart lock. Any question please contact us at any time.