●Convenient Keyless Entry: Enjoy the ease of keypad door lock with 1 master code and 9 access codes available. Create passwords 4 to 15 digits in length, fitting well for bedroom, home, apartment, garage and office. ●Advanced Security: With mute function, smart door knob prevents others from peeping your codes by listening to the sound. The combination of mute and the 15-digit password boosts the security of electronic door lock. ●Versatile Fit: Designed to fit most US standard doors, its adaptable knob suits both left and right-handed doors. The latch is adjustable to accommodate either 2-3/8-Inch (60mm) or 2-3/4-Inch (70mm) backset with 54mm door hole in diameter. ●Multi-Functional: It suits various doors like entry door, garage, back door, bedroom. It is recommended to install the inside knob in indoor. It includes an emergency power supply for battery depletion situations. ●Easy Installation: Set it up in minutes using only a screwdriver, no special skills required. The backlit of keypad door knob ensures convenient code entry even in dark. Please remember to place 2 batteries on each side of the battery box; 4 batteries are needed (not included in the package). ●【For Family】No longer have to worry about your children losing or forgetting keys by using HIDALIFE electric door lock. Each family member can have their own easy-to-remember 4-digit code, ensuring easy keyless entry with door knob with keypad. ●【Sports Lovers】Whether youre strolling down a path or going for a jog, our keypad door knob eliminates the need for bulky keychains and the worry of losing keys. HIDALIFE keyless entry door lock will automatically lock within 5 seconds. Simply enter your personal user code to unlock the keyless door knob when you return home.