[CONVENIENT UNLOCK MODES]Keypad knob supports 2 unlock modes:passcodes and USB backup.The number of available passwords equipped with the keyboard :100.The door lock is equipped with a USB emergency power interface. When the battery runs out, you can connect the power bank to open the door.The keypad door lock operates on 4 AAA batteries(not included) that will last up 1 year. [MULTI-FUNCTION]Admin&User mode:Convenient password management for your family. Slient mode:Humanized setting will protect the quiet atmosphere of your home. Anti-peep:Add a random password before or after your correct password to protect your password from prying. Low battery indication:When the door lock is unlocked with low battery, the red light will flash and the buzzer will ring 10 times. Keypad night light:You can open the door smoothly without fear of darkness. [WIDE APPLICATION]The keypad door lock is suitable for door thickness: 1-3/8'' to 2-1/8'' (35 to 55mm). Adjustable latch: 2-3/8 inches to 2-3/4 inches (60 to 70 mm).It is ideal for all US standard doors.Not need to distinguish between left and right. Free-pass mode can keep it unlocked at any time which is convenient for your family to enter and exit freely.Digital door lock is ideal for home,office,hotel,apartment,bedroom,entrance door,garden gate,storage room, warehouse, basement,etc. [UlTRA-HIGH QUALITY]Different from other conventional door lock,our electronic lock is made of durable zinc alloy material:high reliability/scratch resistant/dustproof/resistant to corrosion.Precise design of transmission mechanism, smoother action and less sound.Allow to 500,000 times use. [EASY INSTALLATION]Keyless door knob is easy to install.Complete installation accessories are included in the package(tools are not included).The tutorial video will save you precious time to install our electronic lock on the door.Even if you are a girl, you can complete the installation in 15 minutes.