Versatile Unlocking Options: Enjoy multiple unlocking methods including APP, Bluetooth, mechanical keys, smart card, WiFi, password, and fingerprint for flexible access to your door Weatherproof: With an IP68 protection level, this lock is highly resistant to dust and water, making it suitable for both indoor and outdoor use in various weather conditions Wide Compatibility: Fits doors with a thickness range of 35-120mm and works with a variety of door materials such as steel, wood, s, brass, stainless steel, and more Built-in Doorbell & Convenient Features: Equipped with a built-in doorbell for added convenience and an elegant polished finish for a modern look. Plus, the handle direction is reversible for easy installation Advanced Connectivity: Features Bluetooth and WiFi connectivity for remote control and monitoring, while its 6V power supply (4x AA batteries) ensures reliable performance even in a wide operating temperature range of -20°C to +60°C