This smart fingerprint door lock integrates three unlocking methods—fingerprint recognition, keypad code entry, and physical key access—into a single compact knob design. Constructed with a zinc alloy shell and a matte black finish, the outer body resists scratches, corrosion, and daily wear, making it suitable for interior doors in bedrooms, apartments, offices, or study rooms. The fingerprint sensor uses a semiconductor chip that captures and stores up to 20 user fingerprints with a recognition speed of less than 0.5 seconds, offering reliable performance for frequent use. The silicone keypad is responsive and features a backlight for low-light conditions, while the built-in auto-lock function engages the bolt automatically after each closure, enhancing security without requiring manual action. The lock mechanism is powered by four AAA batteries (not included), which typically support up to 6, 000 operations under normal usage.

A low-battery indicator alerts users when replacement is needed, and an emergency USB port on the exterior allows temporary power supply via a power bank. The deadbolt is made of hardened steel and fits standard US door preparations (pre-drilled holes for a 2-1/8-inch diameter bore and 2-3/8-inch or 2-3/4-inch backset), simplifying installation for most interior doors. The included mounting hardware and step-by-step manual enable a straightforward DIY setup with basic tools. In terms of stability, the lock maintains consistent response across temperature and humidity variations typical of indoor environments.

The fingerprint algorithm adapts to partial or slightly dry/wet fingers, reducing false rejections. The keypad can store a single master code and multiple user codes, with a temporary code option for guests or service personnel. The physical key override uses a standard emergency key, ensuring access during battery depletion or electronic malfunction. The auto-lock timer can be adjusted to delay locking from 10 to 99 seconds, or disabled entirely for push-to-lock mode.

The product emphasizes straightforward operation and practical durability rather than smart-home connectivity, targeting users who prioritize reliability and affordability. The compact knob design occupies minimal door space and is compatible with both left and right-handed doors. The matte black finish integrates with various interior styles, from modern minimalist to industrial. At a modest price point, this lock offers a balanced combination of essential security features and ease of use, suitable for renters, homeowners, and small office managers seeking a cost-effective upgrade to basic keyed knobs.

The lock’s construction includes a reinforced latch and anti-pry design to resist forced entry attempts for an interior door application. While not intended as a primary security device for exterior doors without a separate deadbolt, it provides adequate access control and convenience for internal privacy areas. The fingerprint sensor’s self-learning algorithm improves recognition accuracy over repeated use, and the keypad material resists fingerprint smudges. The product’s overall value lies in its no-frills approach—offering three access methods in a single unit without complex app or subscription requirements, making it a straightforward solution for controlling entry to bedrooms, offices, or storage rooms.