Keyless Entry & Special Design of Knob: 4-IN-1 Unlock Methods: Our Smart Door Knob features 4 unlocking options: fingerprint recognition, password input, app control, and physical key unlocking. The knob has the perfect size, and is suitable for an apartment, living room, bedroom, office, etc Smart App Control in Bluetooth Range: Easily add and manage users, fingerprints, and passwords through the App, provide access to family members, guests, or temporary visitors, and track unlock logs. With auto-lock, anti-peeping password settings, channels, and privacy modes, ensure your space is secure and accessible on your terms Keyless Biometric Door Knob Access: Our keyless door knob combine touchscreen keypad with fingerprint recognition, 0.1 s fingerprint recognition, up to 30 fingerprints, and 15 access codes Energy-saving Durability: The lock is powered by 4 AAA batteries (not included) with a 9 to 12-month battery life.When the voltage is lower than 4.8 V, after waking up the system, the "SMART" button flashes a red light and beeps 7times, indicating that the batteries need to be replaced Easy installation and Security: Smart door handles can be easily installed in minutes with a screwdriver and are suitable for most US doors. Protecting your personal information, fingerprint, and access code information is stored locally in the lock rather than uploaded to the cloud. If you have any questions or challenges about our door locks, please find us. We provide professional customer technical support A door knob is an essential piece of hardware that combines functionality with style in any home or office space. This classic handle provides a reliable way to open and close doors while adding a finishing touch to your interior design. Door knobs offer a traditional aesthetic that works well with various architectural styles, from vintage homes to contemporary spaces. The rotating mechanism allows for smooth operation, making it easy to access rooms throughout your property. Whether you're updating existing hardware or completing a new construction project, a quality door knob provides the durability and performance you need for daily use. Installation is straightforward for most standard door preparations, and the timeless design ensures it will complement your decor for years to come. Consider your door thickness and existing bore holes when selecting the right door knob for your application.