The TUYA Smart Door Lock is made of a full metal zinc alloy and comes with a C-grade cylinder. It can be unlocked via an APP, Wi-Fi remote control, fingerprint, password, or physical key. It supports the Tuya APP which allows all smart devices to be managed in one place. The lock also supports a Bluetooth mesh network (SIG) and can act as a gateway. Material: Zinc Alloy Door thickness: 38mm-50mm Code Length: 6~10 digits Working Temperature: -20C~70C Working Humidity: 20%~80%RH Working Power Consumption: ?200mA Static Power Consumption: ?30uA Power Supply: 6V (4 x AAA Alkaline Batteries) Unlocking Methods: App, Fingerprint, Password Mechanical Key User Capacity: 100 password users 50 fingerprint users Product Dimension: Front / Back panel 65 x 65 mm Handle Length 167 mm