7-in-1 Unlocking Modes: Supports 3D Face Recognition, Fingerprint, Passcode, IC Card, Tuya App (WiFi), Temporary Password, and Mechanical Emergency Key. Integrated HD Camera: Built-in wide-angle camera allows you to see visitors on your smartphone via the Tuya/Smart Life app before unlocking. Smart Doorbell Function: Includes a built-in doorbell; pressing it triggers a remote unlock request and sends a real-time photo of the visitor to your phone. Enhanced Security: Features an anti-peep virtual password (add random digits before/after your code) and an automatic locking mechanism. High-End Build: Constructed from high-strength Aluminum Alloy with a tempered glass touch panel for scratch resistance and durability. Emergency Power: Powered by a rechargeable lithium battery or AA batteries (model dependent) with a Micro-USB/USB-C emergency charging port. Universal Fitting: Compatible with most standard wooden and security doors (35mm to 120mm thickness) and supports both left and right handle orientations.