1、Unlocking Method: This smart lock supports password, APP, card swiping, and mechanical key unlocking, suitable for more situations, multiple unlocking modes to avoid being locked outside the door. 2、Battery Powered: The lock is powered by 4pcs AA batteries (not included), when it runs out of power, it can be unlocked using a mechanical key or temporarily powered by connecting to the bottom Micro USB. 3、Temporary Password: Remote sending of temporary password, the APP can generate a one time password at any time, send it to temporary visitors, setting an effective time, facilitate visitor access. 4、Applicable Doors: This smart lock is suitable for doors with a thickness of 35‑90mm, used for various indoor and outdoor doors, such as antitheft door, wooden door, stainless steel door, copper door, etc. 5、Wide Application: This smart password lock set is widely used in household, hotel, apartment, rental room, homestay, dormitory, etc., and is convenient to install and operate.