Fingerprint Door Lock Black - Smart Biometric Door Knob 1 Pack

Our review of the Fingerprint Door Lock Black finds it best for homeowners who want a compact, keyless upgrade for interior or apartment doors while keeping a fallback key option. The single biggest reason to consider this smart door knob is its simple, three-mode operation and on-device fingerprint sensor that stores up to 50 prints, offering fast hands-free entry for daily use. Installation is straightforward with a screwdriver, the rechargeable battery removes hassles, and an app provides local Bluetooth control for basic management.

Key Features

• 3 Modes Smart Door Knob: Rotating the thumb around the knob switches between passage, entrance, and privacy modes to fit bedroom or entry needs without complex setup.
• 3-in-1 Access: You get fingerprint, app control via Bluetooth, and a traditional key for reliable backup access when needed.
• Local Biometric Security: The lock stores fingerprints locally for privacy and can hold up to 50 fingerprints so the household can share access without cloud storage.
• Rechargeable Battery: A built-in 400mAh battery recharges in 3 to 4 hours via USB A-to-C so you avoid frequent battery replacements.
• Simple Installation: Designed to fit most US doors and installed with basic tools, the knob is suitable for a homeowner comfortable with a screwdriver.

Who It's For

The Fingerprint Door Lock Black is aimed at renters and homeowners who want a smart, compact door knob for bedrooms, apartments, or interior doors where privacy and quick fingerprint access matter. The combination of biometric entry and a key backup makes it practical for families or shared living spaces where multiple users need reliable access.

It is less suitable for exterior doors that require full weatherproofing or for users who need remote Wi-Fi control right away, since Wi-Fi requires a separately sold gateway and the app functions within Bluetooth range only.

Pros & Cons

Pros

• Easy to install and praised by customers for clear instructions and quick setup.
• Convenient fingerprint unlocking with storage for up to 50 fingerprints for household access.
• Includes app control via Bluetooth and a physical key for dependable backup entry.
• Rechargeable battery and visible power display reduce maintenance surprises.

Cons

• Some customers reported mixed build quality and occasional lock functionality issues, so longevity may vary by unit.
• App control works only within Bluetooth range and Wi-Fi needs an additional gateway purchase.

Specifications

Our Verdict

The Fingerprint Door Lock Black is a practical, value-minded smart door knob for interior and apartment doors, offering fast biometric entry, a Bluetooth app for local management, and a physical key backup. It represents good value for those who prioritize convenience and privacy, but buyers seeking heavy-duty exterior hardware or built-in Wi-Fi should look elsewhere or add the gateway.

Frequently Asked Questions

Can the lock be controlled remotely?
Not by default; app control works within Bluetooth range and Wi-Fi requires a separately purchased gateway.

How long does the battery take to charge?
The built-in 400mAh battery takes about 3 to 4 hours to charge fully using the supplied USB A-to-C cable.

How many fingerprints can it store?
The lock stores up to 50 fingerprints locally to protect user privacy without cloud upload.