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This smart lock only supports doors no thicker than 55mm. 【Six-in-One Keyless Lock】Multiple unlocking methods are available: fingerprint, password, key fob, mechanical key, APP control, and remote control (Wi-Fi gateway required). Our smart lock can switch to a normal unlocking mode for instant unlocking without verification, suitable for everyone, including the elderly and children. 【Virtual Password Unlock】Enter the correct password in sequence to unlock, preventing others from seeing it. Our smart lock supports 9 administrators and 291 users, supports fingerprint/password/card (100 groups), and can create an unlimited number of temporary passwords for visitors, ensuring maximum security. 【Unlock Anytime, No Waiting】Fast and silent electric smart lock with a keypad; fingerprint recognition speed is less than 0.5 seconds; one-button locking when leaving; backlit keypad and low battery warning; silent mode; waterproof. This combination lock perfectly complements traditional and modern home styles, making it ideal for hotels, dormitories, apartments, short-term rentals, Airbnb accommodations, bathrooms, bedrooms, or private rooms. 【High-Quality Smart Lock】This lock keypad is ANSI Level 3 certified, IP54 rated for protection, and highly weather-resistant, operating normally in temperatures ranging from -25°C to 70°C. Installation is simple, requiring only a screwdriver, and programming can be completed in minutes. It can quickly replace existing lock handles, knobs, or latches, and is compatible with all US standard left- and right-opening doors. 【Maximum Security and Durability】This electronic lock uses four AA batteries (not included), offering low power consumption and long-lasting durability. It automatically alerts you when the battery is low, prompting you to replace the batteries. A latch hole is provided at the bottom of the lock body for use in case of power failure or emergency opening via a built-in USB emergency power interface.