1Premium 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. 2Multiple 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. 3Anti 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. 4Stylish 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. 5Easy 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.