How to Use: Follow the instructions in the manual, complete the installation operation, download the corresponding APP, and use it according to the good battery (not included) Specification: Item Type: Fingerprint Door Lock Material: Zinc Alloy and Stainless Steel Gross Weight: 1174g / 41.4oz Battery Parameters: 4 AAA batteries (not included) Fingerprint Capacity: 100 Unlocking Method: APP, fingerprint, password, key App: for Tuya Password Length: 6-10 characters Emergency Power Supply: USB power supply Relative Humidity: 20%-80% RH Applicable Door Thickness: Approx.38-50mm / 1.5-2.0in Applicable Door Type: wooden door, indoor door, security door Package List: 2 x Key 2 x Smart Lock 2 x Manual 9 x Screw 3 x Accessories 1 x Lock Tongue 2 x Washer