Security Lock: The lock is made of aluminum alloy to ensure the security of your home and offers a backlit keypad, low battery indicator, anti-prying user code, and weather resistant (IP54) features. Easy to Use: The lock can be installed in less than 15 minutes with just a screwdriver, and the 4-8 digit code is simple and easy to program. Code Entry: The keypad lock provides 20 codes for family members, or you can set a one-time code for guests, and you can also unlock the door with a key (Duplicable). Auto Locking: You can set the auto-lock time from 5 to 99 seconds, and you can also disable the auto-lock to keep the lock unlocked. Satisfactory Service: With a 30-day money-back guarantee,1-year product coverage,and lifetime after-sales support,if you have any questions, please feel free to contact us, and we'll respond promptly.