Features 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. 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. 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. 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. 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. Specification:Item Type: Smart Password Lock Battery: 4 x AA Battery (not included) IC Card: 100 Sets Unlocking Methods: Password, APP, Card, Mechanical Key Applicable Door Types: Anti Theft Door, Wooden Door, Stainless Steel Door, Copper Door Door Thickness: Approx. 35-90mm / 1.4-3.5in Package List:2 x Lock Body 2 x IC Cards 8 x Accessories 8 x Screws 2 x Keys 1 x User Manual Package List 2 x Lock Body 2 x IC Cards 8 x Accessories 8 x Screws 2 x Keys 1 x User Manual