This fingerprint smart door knob combines biometric recognition, a tactile keypad, and app-based control into a single compact unit designed for interior doors in bedrooms, storage rooms, apartments, offices, and hotels. The lock body is constructed from a durable zinc alloy casing that resists corrosion and everyday wear, ensuring long-term reliability in moderate indoor environments. The fingerprint sensor adopts a capacitive semiconductor module that captures high‑resolution ridge details, enabling quick and accurate user authentication even with slightly moist or dry fingertips. Up to 50 fingerprints can be stored, and the numeric keypad allows entry via a personalized PIN code, making it suitable for households with multiple users or guests who require temporary access.

The accompanying mobile application connects via Bluetooth and provides remote locking/unlocking, real-time status checks, and activity logs, all without the need for a Wi‑Fi hub. The app interface is straightforward and supports firmware updates to maintain security standards over time. The inner mechanism uses a low‑power motor that drives the latch smoothly and quietly, minimizing noise disturbance during night use. Four AA batteries power the unit, and the intelligent battery management system provides low‑power alerts through the app and an audible indicator on the lock itself.

The estimated battery life under normal usage (approximately 10–12 operations per day) can reach six to eight months, depending on ambient temperature and usage frequency. The external finish is a matte black coating that resists fingerprint smudges and blends well with modern interior decor. The door knob design maintains a familiar form factor, allowing easy installation on standard 1.38‑inch to 2.17‑inch thick doors with a 2.375‑inch backset. The installation process does not require drilling or complex wiring; the included template and hardware enable most users to complete the setup in under half an hour.

From a performance standpoint, the fingerprint recognition speed is typically under 0.5 seconds, with a false acceptance rate of less than 0.001% and a false rejection rate of around 1%, meeting typical expectations for residential security devices. The keypad is responsive and includes a backlight for use in dim environments. The app connectivity maintains a stable connection within a 30‑foot range, and the lock logs every activity with a timestamp, allowing users to monitor entry patterns. The absence of a physical keyhole reduces the risk of lock picking, and the built‑in anti‑tamper alarm triggers after five consecutive incorrect attempts, deterring unauthorized access.

This lock is optimized for interior doors where moderate security and convenient keyless entry are desired. It is particularly well‑suited for spaces that are used frequently by multiple individuals, such as office meeting rooms, hotel guest rooms, or shared apartments. The materials and construction are chosen to provide a balance between durability and affordability, offering a reliable security upgrade at a very reasonable price point. Regular firmware updates and a simple user interface ensure that the product remains functional and secure over its service life, making it a practical choice for those seeking to transition to a smart lock without a significant investment.