Versatile Unlocking Options: Unlock your door using multiple methods, including an app, Bluetooth, mechanical keys, card, password, or fingerprint, offering both flexibility and security for all users Wide Compatibility with Door Types: Designed to fit various door types—steel, wooden, brass, stainless steel, and more—this lock accommodates door thicknesses from 30mm to 55mm, ensuring a wide range of applications Built-in Doorbell for Added Convenience: The lock features a built-in doorbell, so you don't need an extra device. Visitors can easily ring the doorbell from the lock, enhancing convenience Stylish Design: Crafted from high-quality aluminum alloy with a polished finish, this smart lock is both and aesthetically pleasing, complementing a variety of home or office styles Bluetooth Connectivity for Seamless Access: The lock supports Bluetooth connectivity, allowing you to unlock the door from your phone directly via the dedicated app, ensuring easy and secure access without needing to be in physical proximity. Additionally, the handle direction is reversible for user customization, Manufacturer: QZCX