Versatile Unlocking Options: Offers multiple unlocking methods including fingerprint recognition (FPC sensor), APP, Bluetooth, password, smart card, and key, providing flexible and secure access for all users Built-in Doorbell: Features an integrated doorbell for added convenience, allowing you to both secure your door and communicate with visitors easily Elegant Design: Constructed from high-quality aluminum alloy with a sleek IML touch screen material, combining durability with an elegant modern aesthetic to complement various door types Wide Compatibility & Reversible Handle: Compatible with door thicknesses ranging from 35mm to 55mm, and works with steel, wooden, brass, and stainless steel doors. The reversible handle design ensures flexibility during installation Efficient Power Management: Powered by 4 non-rechargeable AAA 1.5V alkaline batteries (not included), with a low operating temperature range of -20°C to 55°C, making it reliable for use in various environments, Manufacturer: CXCDSS