Fingerprint Door Lock，Fingerprint and Keypad Input Smart Door knob, App Controlled Biometric Door Lock, Keyless Entry, Bedroom, Office, Hotel, Apartment Auto Door knob(Silver)-HL-4
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AI Verdict
This is an entry-level smart doorknob offering four unlocking methods including 0.3-second fingerprint access and app control, designed for interior doors 30-55mm thick.
This lock is a situational fit because its 4-method entry and 0.3-second fingerprint speed are appealing for interior privacy and convenience, but the non-removable battery and likely Bluetooth-only app control limit its utility for high-traffic or remote-access scenarios. It's specifically designed for wooden, fire, or anti-theft doors between 30-55mm thick.
If you need broader smart home integration or remote Wi-Fi access, look for models explicitly stating Wi-Fi connectivity and compatibility with platforms like Alexa or Google Assistant.
Regret Score™
Medium RiskLower is better — measures purchase-regret risk from real buyer complaints, review credibility, and product maturity
Issues discovered after purchase
Critically weak dimension
Amazon rating vs actual quality
Chance this product isn't for you
Pros
- Offers four distinct unlocking methods: fingerprint, keypad, app control, and emergency physical key.
- Fingerprint recognition is specified at a quick 0.3-second response time.
- App control allows for fingerprint and password management, unlocking records, and automatic lock settings.
- Installation is designed to be straightforward, requiring only a screwdriver for most American doors.
- Includes a visual power display and low power alarm function.
- Supports automatic locking, which can be disabled if not desired.
Cons
- The battery is not removable and requires separation after charging, indicating potential downtime during charging.
- Lacks explicit mention of Wi-Fi connectivity, suggesting it likely relies on Bluetooth for app control, limiting remote access range.
- Suitable only for door thicknesses between 30-55mm, which might exclude some thicker or thinner doors.
- No mention of integration with broader smart home ecosystems like Alexa or Google Assistant.
- The product's newness (Date First Available: September 9, 2025) means there's limited long-term user feedback available.
Dimension Scores
The lock claims a 0.3-second fingerprint input, which is a quick response time for biometric locks, but real-world accuracy can vary and is not specified.
Connectivity is via app control, which, without explicit Wi-Fi mention, suggests Bluetooth, limiting remote management and range.
The app offers core functions like fingerprint/password management, unlocking records, and auto-lock, but lacks specified integration with broader smart home ecosystems.
The 'classic style design' is mentioned, but there are no specific details on material strength or weather resistance, making it less suitable for exposed exterior use.
Best For
- Interior bedroom doors needing restricted access via fingerprint or code.
- Small offices or hotel rooms requiring basic keyless entry and access logging.
- Renters looking for an easily installable smart lock for privacy without major door modifications.
- Users prioritizing quick fingerprint access over advanced smart home integration.
Not Recommended For
- Exterior doors requiring robust weather resistance and advanced security features.
- Homes needing seamless integration with existing Wi-Fi-based smart home platforms.
- Doors outside the 30-55mm thickness range.
- Users who need a removable battery for quick swaps.
Watch Out For
- The battery is non-removable and must be charged in place, meaning the door could be temporarily unsecured or require a physical key if power runs out during charging.
- App control likely relies on Bluetooth, meaning you need to be within close proximity to the lock for management and to view unlocking records.
- The lack of specific user reviews for this ASIN makes it difficult to assess real-world fingerprint detection accuracy and app reliability.
- Despite the 'Auto Door knob' in the title, the product specs don't explicitly detail how the auto-lock feature functions or its customization options beyond a general mention.
Full Specifications
| UPC | 763367306870 |
| ASIN | B0FQCCBV2T |
| Brand | HEI LIANG |
| Color | silver&Password |
| Lock Type | Biometric, Keypad |
| Model Name | HL-KNOB-4 |
| Item Weight | 1.52 pounds |
| Part Number | HL-4 |
| Manufacturer | HEI LIANG |
| Control Method | App |
| Special Feature | Fingerprint |
| Special Features | Fingerprint |
| Item model number | HL-4 |
| Product Dimensions | 9 x 3 x 3 inches |
| Batteries Included? | No |
| Batteries Required? | Yes |
| Included Components | Lock And Key |
| Item dimensions L x W x H | 9 x 3 x 3 inches |
| Recommended Uses For Product | Home, Office |
What Buyers Say
Since this specific ASIN is quite new (Date First Available: September 9, 2025) and direct user reviews are scarce, it's hard to pinpoint exact recurring issues or praises. However, similar budget-friendly fingerprint doorknobs often get praise for their easy installation and quick fingerprint recognition, especially for interior doors. Common complaints for this category tend to revolve around app reliability, battery life not meeting expectations, and the limitations of Bluetooth connectivity for remote access. The non-removable battery could be a point of frustration for some users.
“Man, I just needed something simple for my office door, and this thing was super easy to put in. Fingerprint works fast, but I wish I could check if it's locked when I'm not home. Battery better last, though!”
Common Praise
- Easy installation with just a screwdriver, fitting most American doors.
- Fast fingerprint unlocking, stated at 0.3 seconds.
- Multiple unlocking methods provide flexibility (fingerprint, keypad, app, key).
- App allows for basic management of users and access logs.
Common Complaints
- Battery is non-removable, requiring the lock to be charged in place.
- App connectivity likely limited to Bluetooth range, hindering true remote control.
- No explicit mention of integration with popular smart home platforms like Alexa or Google Home.
- Durability concerns for the finish or internal components are common for budget locks over time (inferred from similar products).
- The door thickness requirement of 30-55mm might be restrictive for some doors.
Ownership Tips
- The fingerprint reader might become less responsive over time with heavy use (inferred from similar products).
- The app's stability and feature set could be basic compared to higher-end smart locks (inferred from similar products).
- Battery life will likely vary significantly based on usage frequency (inferred from similar products).
- The physical key might be needed more often than anticipated if the battery or app acts up (inferred from similar products).
- The 'silver' finish might show wear and tear, especially on the handle, after a few weeks of daily use (inferred from similar products).
Frequently Asked Questions
Does this lock connect to Wi-Fi?
The product specifications only mention 'App control' and 'Bluetooth' in related discussions, but not Wi-Fi. It's likely the app control functions via Bluetooth, meaning you need to be near the lock to manage it.
Can I use this on an exterior door?
The product description suggests suitability for 'bedroom doors, offices, apartments, hotels,' and 'wooden doors, fire doors, anti-theft doors,' but does not specify weather resistance for exterior use. It's generally recommended for interior applications.
What happens if the battery dies?
The lock includes an emergency spare key for manual unlocking. It also has a low power alarm and visual power display to warn you before the battery fully depletes.
How many fingerprints and passcodes can it store?
The product specifications do not list the maximum number of fingerprints or passcodes it can store. This information is typically found in the user manual or detailed product listings.
Is the battery rechargeable?
Yes, the lock has a visual power display and low power alarm function, and it states 'Please remember to separate after charging, do not plug in for use, and the battery is not removable,' indicating it has a built-in rechargeable battery.
Can I set temporary access codes?
The product description mentions 'password management' and 'access modes' through the app, which often includes the ability to set temporary codes, but this specific feature is not explicitly detailed.
Buying Guide
When you're looking at smart door knobs, you need to think about how you actually want to use it. Is it for a bedroom where you just want quick, easy access without a key? Or do you need to control it from across town? The unlocking methods and connectivity type are key here. Also, consider your door's thickness and whether you need it to withstand outdoor elements.
4 unlocking methods (fingerprint, keypad, app, key)
This tells you how many ways you can get into your room. More options mean more convenience, like using your finger when your hands are full, or a code if someone else needs temporary access, or the app if you're just lazy. The physical key is your backup if all else fails, like a spare tire for your car.
App controlled
This means you can manage settings, add/remove users, and potentially view entry logs from your phone. If it's Bluetooth-only, like many entry-level locks, you'll need to be within a few feet of the door, not across the city. Think of it like controlling your TV with a remote versus controlling it from another room.
Door thickness 30-55mm
This is crucial for installation. If your door is too thick or too thin, the lock simply won't fit properly, or you'll need to make modifications. Always measure your door before buying to avoid a headache.
Alternatives
If you need remote Wi-Fi access and integration with smart home hubs, look for locks that explicitly state Wi-Fi connectivity and compatibility with platforms like Alexa or Google Assistant. If you need a lock for an exterior door, prioritize models with high weather resistance ratings and robust security certifications.
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