CONVENIENT KEYLESS ENTRY: Enjoy seamless access with a smart keypad door knob featuring 3 master codes and 17 user codes, each ranging from 4 to 8 digits. Includes two mechanical keys for backup, ideal for bedrooms, homes, apartments, garages, and offices. EASY INSTALLATION & UNIVERSAL FIT: This smart door knob is designed to fit most US standard doors. It features an adaptable knob that works for both left and right-handed doors and an adjustable latch to fit 2-3/8-Inch or 2-3/4-Inch backsets, with a 54mm door hole diameter. LONG-LASTING RECHARGEABLE BATTERY: Equipped with a built-in rechargeable battery, this smart door knob ensures up to 10 months of operation on a single 3-hour charge, perfect for securing bedrooms, offices, and apartments without frequent maintenance. MULTIPLE MODE FUNCTIONS: Switch between Normal, Passage, and Privacy modes with ease using the intuitive button on the interior knob. This feature enhances user convenience by adapting to different privacy needs throughout the day. ENHANCED SECURITY FEATURES: The automatically secures your door 5 seconds after closing, and supports anti-peep passcodes, allowing the addition of random digits before or after your actual code to prevent unauthorized access. The actual product may have slight color difference or difference, which not affect the use Colour:Black Material:Metal Package Contents: 1 x Smart Door Knob with Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.