This 4-in-1 smart door knob combines fingerprint recognition, touch keypad code, biometric app control, and auto-lock functionality into a single compact unit.

Crafted from durable zinc alloy and reinforced ABS plastic, the exterior housing resists corrosion and everyday wear, maintaining a sleek matte finish over prolonged use. The biometric sensor achieves rapid and accurate fingerprint reading through capacitive scanning technology, supporting up to 50 user fingerprints. The built-in microchip processes authentication in under 0.5 seconds, ensuring swift entry without delay. The backlit keypad offers tactile feedback and is designed for easy operation even in dim lighting, while the app control feature enables remote locking and unlocking via Bluetooth or Wi‑Fi, depending on the model variant. The auto-lock mechanism engages automatically after a preset delay, enhancing security by eliminating the risk of forgetting to lock the door. Power is supplied by four AA batteries (not included), with a low battery indicator alerting users when replacement is needed. An emergency micro‑USB port provides backup power in case of battery depletion. The lock fits standard door thicknesses (35‑50 mm) and requires only a screwdriver for installation, with all necessary mounting hardware included in the package. Its weather‑resistant design makes it suitable for indoor use in bedrooms, home offices, garages, apartments, and warehouses, though direct outdoor exposure should be avoided. The front panel measures approximately 130 x 56 x 16 mm, and the tail piece is compatible with both left‑handed and right‑handed doors. With its modest price point of $37.00, this smart lock delivers a balanced combination of biometric security, convenient keyless entry, and smart home integration. The absence of mechanical backup keys emphasizes the fully electronic nature of the system, while the simple installation process and intuitive interface make it accessible for users unfamiliar with smart locks. The lock’s firmware can be updated through the companion app, ensuring long‑term compatibility and performance improvements.

This product offers practical features for enhancing access control in residential and light commercial settings without requiring extensive modifications to existing doors.