Harfo Smart Door Lock, Heavy Duty Keyless Entry Door Lock,
$129.99
Product Overview
The Harfo Smart Door Lock combines advanced security technology with everyday convenience, offering a modern upgrade to traditional door entry systems. Engineered through years of research and development, this keyless entry lock integrates five distinct unlocking methods—fingerprint scanning, numeric passcodes, IC cards, smartphone app control, and physical backup keys—into one sleek, user-friendly device. Designed for homeowners who prioritize both safety and smart living, the Harfo Smart Door Lock eliminates the need for physical keys while maintaining robust protection against unauthorized access.
What sets this lock apart is its emphasis on accessibility and ease of use. Whether you’re tech-savvy or simply tired of fumbling for keys, the Harfo system adapts to your lifestyle. It supports up to 300 unique users across all access methods, making it ideal for families, frequent guests, or rental property managers. The reversible handle design ensures compatibility with both left- and right-handed doors without requiring structural changes, and installation takes just minutes using only a standard Phillips screwdriver—no drilling, no locksmith, no hassle.
While the core functionality works independently, true smart home integration requires pairing with the Harfo Wi-Fi Gateway (sold separately), enabling remote locking/unlocking via smartphone and voice control through Alexa or Google Assistant. This feature transforms the lock into a connected device you can manage from anywhere, whether you’ve forgotten to secure your door at home or need to grant temporary access to a service provider while traveling.
Key Features
- 5-in-1 Keyless Entry System: Unlock using fingerprint recognition, custom passcodes, IC cards, smartphone app, or physical backup keys—ensuring flexibility for every household member and visitor.
- Remote Control & Voice Assistant Compatibility: When connected to the Harfo Wi-Fi Gateway (sold separately), you can lock or unlock your door remotely via the companion app and activate hands-free operation through Alexa or Google Assistant.
- Effortless Installation: Designed for DIY setup with no additional drilling required. The reversible handle fits standard left- or right-hinged doors, and installation completes in under 10 minutes using just a Phillips screwdriver.
- Intelligent Security Modes: Auto-lock activates after a preset delay to prevent accidental door openings; anti-peep passcode entry hides your code digits during input; private mode disables the keypad temporarily to maintain discretion.
- Multi-Level Access Management: Assign permanent, one-time, or personalized access codes to family members, guests, or staff. Grant administrator privileges to trusted individuals for full control over permissions.
- High-Capacity User Support: Accommodates up to 300 total users across fingerprints, passcodes, and IC cards—perfect for busy households or shared spaces like vacation rentals.
- Reliable Power Backup: Operates on standard batteries but includes an emergency USB port beneath the lock for temporary power supply via power bank when battery life is depleted. Physical keys remain available as a fail-safe.
Technical Specifications
- Unlock Methods: Fingerprint, Numeric Passcode, IC Card, Mobile App, Physical Key
- Maximum Users: 300 (combined across all access types)
- Door Thickness Compatibility: 35mm to 55mm (1 3/8 inch to 2 3/16 inch)
- Handle Design: Reversible for left- or right-handed doors
- Installation Tools Required: Phillips screwdriver only—no drilling or professional help needed
- Wi-Fi Integration: Requires separate Harfo Wi-Fi Gateway for remote and voice control features
- Power Source: Standard battery operation with emergency USB backup port for temporary charging
Benefits & Use Cases
The Harfo Smart Door Lock excels in scenarios where convenience meets security. For families, it allows children or elderly relatives to enter independently using familiar methods like fingerprints or simple passcodes, reducing reliance on physical keys that can be lost or copied. Parents appreciate the ability to create temporary codes for babysitters or after-school helpers without sharing master keys.
Rental property owners and Airbnb hosts benefit significantly from remote access management. Issue time-limited passcodes to guests that expire automatically, monitor entry logs in real time, and revoke access instantly if needed—all without needing to meet in person for key exchanges. This reduces friction for renters and minimizes risk from lost keys or unauthorized duplication.
Homeowners concerned about security will value the anti-peep and private modes, which prevent others from observing passcode entry and allow temporary deactivation of the keypad during sensitive situations. The auto-lock function adds peace of mind by ensuring doors remain secured even if someone forgets to lock manually. Combined with the emergency USB and physical key options, there’s no scenario where you’re permanently locked out due to dead batteries or technical issues.
Since installation requires minimal tools and no structural modifications, the Harfo lock suits renters and homeowners alike. It’s especially valuable in older homes where adding electronic components might be impractical. The reversible handle further enhances versatility, fitting seamlessly onto existing door frames regardless of hinge orientation.
Important Notes
Before purchasing, confirm your door thickness falls within the 35mm–55mm (1 3/8″–2 3/16″) range to ensure compatibility. Remote and voice control capabilities are exclusive to units paired with the Harfo Wi-Fi Gateway, which must be bought separately. Emergency charging via USB is intended only as a temporary solution until replacement batteries are installed.
The package includes: one Harfo Smart Door Lock unit, mounting hardware, user manual, two backup keys, and clear instructions for installation and setup. During initial configuration, test each unlock method to verify proper operation and adjust settings according to your preferences. Always retain backup keys in a secure location outside the home for emergencies.
This product reflects Harfo’s commitment to merging innovation with practicality—delivering a smarter, safer way to protect your entryway without complexity or cost. With its blend of intuitive design, flexible access options, and reliable performance, the Harfo Smart Door Lock represents a meaningful step forward in residential security.
6 reviews for Harfo Smart Door Lock, Heavy Duty Keyless Entry Door Lock,
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Alice K. –
Secure and Convenient
I recently installed the Harfo Smart Door Lock, and it has exceeded my expectations in every way. The installation was straightforward, even for someone with limited DIY experience. The lock’s sleek design and durable material give it a high-quality feel, ensuring it will withstand daily use.The lock offers multiple unlocking options, including fingerprint recognition, a touchscreen keypad, passcode entry, IC cards, and a backup key. The 3D fingerprint sensor is incredibly accurate, providing peace of mind that only authorized individuals can access the building. The lock can store up to 300 users, which is perfect for where we use this lock.One of the standout features is its compatibility with Alexa and Google Assistant, allowing for convenient voice control. Additionally, with the Harfo Wi-Fi Gateway (sold separately), I can remotely lock and unlock the door, set up access codes, and check access records from anywhere. This level of control is incredibly convenient and enhances the overall security of my home.The lock’s battery life is impressive, lasting up to 9 months to 1 year with normal use. It uses 1.5V AA dry batteries, which are easy to replace. The OLED display and voice guide make the setup process user-friendly, and the double verification system adds an extra layer of security.The customer service is excellent, promptly responding to all issues and standing firmly behind their warranty. This level of support has made me feel confident in my purchase and reassured that any potential issues will be handled swiftly and effectively.Overall, the Harfo Smart Door Lock is a fantastic investment for anyone looking to improve their home/office security. Its combination of advanced technology, ease of use, robust design, and top-notch customer service make it a top choice for modern access control.
Brian Kebschull –
Great lock with lots of features and excellent app
This lock is great. It has lots of features and everything works well.Installation was simple. A template for hole is provided for hole cutouts if you are installing it on a new door.I bought it for my bedroom door, and the main requirement was that it have a good fingerprint reader, so that I could get in quickly without needing a key or to punch in a code. The reader works very well and very fast, I’d say less than half a second to open. One thing I love about it is that the reader is angled at roughly a 45 degree angle, which makes putting a finger on it (I typically use my thumb) more comfortable than most fingerprint locks, which have vertical fingerprint readers. That may seem like a little thing, but it just feels like a more natural and ergonomic position.You can set up numerical codes (I think between 4 and 10 digits), and they can be permanent, one time use, or time-based. So, for example, you can set up a code that works from 4pm on Friday until noon on Sunday, so it’s perfect for an AirBnB, houseguest, maid, etc. The code entry also worked flawlessly.Three keycards are included. You just put the keycard up against the keypad and the lock opens instantly. Honestly, I don’t really foresee using them – as great as they work, I’ll just use the fingerprint reader and avoid having to take anything out of my pocket.The backup keys provided in case of power failure (i.e., dead batteries) work fine. One minor nitpick is that the keyhole is hidden behind the face of the front handle, accessed by pushing on one end of the handle. It works fine, but my question is, will I remember 5 years from now (or whenever) how to access the keyhole?The TTLock app is really good too. That was a bit surprising to me, since a lot of apps for these kinds of things seem like afterthoughts. This one is intuitive and easy to use.If you have the gateway for the lock (purchased separately), it connects to the internet though your WiFi, and then you can even open the lock remotely. That’s a feature I’m not planning to purchase, but I can see how it could come in handy for some people.There are a couple of features that I had not read about that I like. One is that the time that the door stays unlocked after being opened is very customizable (default is 5 seconds) through the app. Another is that you can set a daily period of time during which the door will stay unlocked, and then lock automatically. So, for example, you could leave it unlocked at night so that if the kids get scared, they can come in without them having to knock and you having to go open the door.The 4 AA batteries are easily installed. You need to remove one screw to access the batteries.A couple of minor niggles: I got the lock in aged bronze, which looks great, but the latch bolt and strike plate are both silver – would be nice if they were also aged bronze to match. Also, one thing I could do without is the voice saying “unlocked” when the door is unlocked and “locked” when it automatically locks again. You can control the volume of the voice by a setting in the app, but can’t turn it off entirely. I think it’s unnecessary, as there is a light that briefly turns green when the lock unlocks, and you can hear the it unlock and lock, so to me the voice confirmation isn’t needed.But overall, this is as perfect an electronic lock as I’ve found. I can’t vouch for its durability, since I’ve only recently installed it, but I’m very happy with this purchase, and I’m thinking about buying one for my garage.
Suki –
Worked for a few months then broke – Seller Sent Replacement
Initially the lock was great. It had a lot of functions with the app control, passcodes, and fingerprint option. It was convenient and worked for about 4 months but then it suddenly broke. Out of the blue the lock would say it was unlocking but would remain locked. I was locked out for a while and ended up having to break it to get back in.I have another electronic lock from a different brand thatâs lasted a year with no issue. The price point was similar so for a lock at this price to stop working after such a short time is unacceptable.Update: Seller reached out to me and sent me a replacement lock. So far the new lock is working fine.
Gerald Wells –
Fantastic Lock
I purchased this lock for my mother. I have multiple Schlage locks at my house of varying types. I have been using the smart locks for at least the last 11 years. I was going to get my mother a Schlage Lock for her new house, but I noticed that she was having problems seeing the numbers to enter when she was at my house. I purchased this lock because it had the additional feature with the thumb print. This feature is so cool. It works well for an older person or even a young person. It has so many methods that you can use to open the door. This is an excellent product that I prefer over my current Schlage locks. The price was also excellent.
Becca B –
Good Concept, Poor Quality
We installed the new door handle, rearranged the locks since it needs the deadbolt moved, and it worked pretty well for two weeks. After two weeks the handle and electronics technically work and are responsive (says “unlocked” when print scans or tag, etc), but it doesn’t actually unlock the door anymore. So now we can exit our house but not enter. It’s been weeks of trying to adjust settings and reset and check everything but no luck so far. Likely have to purchase a replacement from a different company.
Amazon Customer –
Little confusion around whether it is locked now or unlocked unless voice says so.. voice is good.