1、Premium Metal Materials: Made of excellent aluminum alloy and stainless steel, the door knob lock is durable and reliable, suitable for 35 to 55mm wooden and room doors. 2、Multiple Password Options: With a password length of 6 to 8 digits, the door knob lock can store up to 45 sets of passwords, including 3 for administrators and 42 for regular users. 3、Anti Peep Function: Featuring a dummy password option, the keypad door knob allows users to input random numbers before and after the correct password, unlocking with a maximum limit of 16 digits. 4、Stylish and Functional Design: Designed in a round ball shape for aesthetics and practicality, the door knob lock offers various unlocking methods such as password entry, key access, and more to meet different needs. 5、Easy Installation: Simple to install, the electronic door knob lock is suitable for use in homes, apartments, garages, offices, and other locations, providing added security guard for peace of mind. Item Type: Keypad Door Knob Lock Material: Aluminum Alloy, Stainless Steel Weight: Approx. 678.00g/23.92oz Capacity: 45 Sets (3 Sets for Administrators, 42 Sets for Regular Users) Password Length: 6 to 8 Digits Virtual Password Guard: Dummy Password Anti Snooping, Can Be Entered Before Or After The Correct Password At Any Time, The Maximum Limit of 16 Digits Application: Standard Wooden Doors, Office Doors, Narrow Doors, Eco Friendly Doors Power Supply: 1 x 3.7V 400mAh Ternary Lithium Battery (Built in Battery Included) Unlocking Method: Password or Key Door Thickness Compatibility: 35 to 55mm/1.38 to 2.17in Round Ball Knob Size: Approx. 80x57mm/3.15x2.24in 2 x Round Ball Knob 1 x Lock Body 1 Bunch x Keys(2PCS Keys) 1 x User Manual 4 x Short Screws 2 x Long Screws 1 x Corner Support Plate 1 x Installation Key 1 x Corner Support Plate Shell