The Xiaomi Smart Door Lock 4 Pro is here to put your front door at the heart of your smart home, combining surveillance, access control, and advanced home automation in a single device. With a design more reminiscent of a high-end gadget than a traditional lock, it integrates cameras, biometrics, radar, and an interior screen, so everything is under your control. We're talking about a comprehensive solution with up to 12 unlocking methods and security features that go far beyond simply opening and closing.
If you're looking to significantly enhance the security of your home—or business—this model is one of the most comprehensive in Xiaomi's catalog. In addition to its sleek and minimalist design, it features a dual-camera system to reduce blind spots, advanced night vision, and connectivity with the Xiaomi Home app. In addition, it offers several months of autonomy, hybrid power, and a silent automatic locking system that provides peace of mind on a daily basis.
A design that fits any door and a premium approach
At first glance, the Smart Door Lock 4 Pro stands out for its understated style, with clean lines and a dark finish that blends seamlessly with both modern and classic doors. It's not bulky or ornate: Xiaomi has opted for an elegant and functional design that conveys a sense of solidity. In fact, several media outlets point out that it abandons the purely utilitarian aspect of previous generations to adopt an aesthetic closer to a high-end smartphone.
The design eliminates unnecessary elements from view—there are references to models without a doorknob or handle—and replaces them with a clean panel and a "cat's-eye" style interior screen. This 3,97-inch screen allows you to see what's happening on the other side without getting up from the sofa and activates when someone rings the doorbell. This practical, discreet, and premium approach makes this lock a valid option for both home and professional environments seeking a good image and security.
The integrated screen is not merely an aesthetic feature: it allows for real-time monitoring and intuitive local control. It also enables the lock to function as a digital peephole with higher quality than traditional models, especially thanks to its integration with cameras. Ultimately, Xiaomi's proposed experience is to transform the door into a smart control point, providing real-time visual information without complications.
The ergonomics are designed for everyday use: the locking system is fully automatic and silent, activating upon closing and reducing noise from the mechanism. This is complemented by a Level C mechanical security cylinder, the highest standard in its category, with drill resistance and a robust approach against physical attacks. This combination of reinforced structure and silent mechanisms is key to making the lock go unnoticed in operation, but not in resistance.
As a key component of the brand's ecosystem, its design also prioritizes integration with other devices in the home. It's not just about looks; it's designed to coordinate lighting, cameras, and climate control when it detects your arrival or departure. Thanks to its minimalist finish and connected approach, it can be said that it "catches the eye" and, above all, it is noticeable in daily use.
Dual cameras and intelligent vision for blind spot surveillance
One of the most appealing features of the Xiaomi Smart Door Lock 4 Pro is its vision system. It integrates a dual-camera module with a 3 MP main sensor and a 2 MP secondary sensor that work together to widen the field of vision and reduce blind spots. According to various specifications and media, the system offers wide coverage angles (with references to 160° in the main camera and 128°/152° in the secondary camera, depending on the edition), which helps to see both the caller and the packages left on the ground.
The exterior "Cat Eye" camera setup, with its 2MP ultra-wide-angle lens, enhances coverage on the landing and is supported by AI algorithms for person and loitering detection. In low-light conditions, the system activates dynamic night vision with five infrared LEDs and the option to switch between low-light color and infrared black and white. The important thing is that, even at night, the image remains clear and useful for identifying faces or situations at the door.
The lock can record and automatically notify you when someone lingers in front of the door longer than usual. This is made possible by millimeter-wave radar and AI-powered human presence detection, which filters out false positives and focuses alerts on what matters. Xiaomi's idea here is that you don't have to be on the lookout: if something relevant happens, you'll receive an alert on your mobile with the corresponding clip.
From the 3,97-inch indoor screen, you can watch live video or see who called, and from your smartphone, you can access both real-time viewing and call history. Some sources even mention connectivity with Xiaomi smart TVs and displays for answering calls or unlocking the phone remotely. This visual ecosystem puts surveillance just a tap away, whether you're at home or away.
Together, this video module transforms the Smart Door Lock 4 Pro into a hybrid entryway lock and security camera. You control access, but you also monitor what's happening at your doorstep. For those who live in apartments with busy landings or receive packages frequently, this is a significant advantage over locks without integrated vision.
State-of-the-art biometrics and up to 12 ways to enter
The Smart Door Lock 4 Pro is in a league of its own when it comes to access control. It offers a dozen unlocking methods that cover virtually any scenario: advanced biometrics, passwords, NFC, Bluetooth, and a traditional key as a backup. This multi-protocol approach shines especially in families or offices with very different usage profiles.
The standout feature is the AI-powered palm vein recognition. It uses near-infrared light to scan the vein pattern under the skin and compare it to a registered profile, all without contact. Reported data indicates unlock times of less than one second and extremely low rejection rates (with figures below 0,001% in the dual-camera version). Beyond the spectacular, it solves common problems: worn footprints, wet hands or height differences in children are no longer an obstacle.
3D facial recognition with liveness detection adds another layer of security: the lock analyzes depth and features to prevent impersonation using photos or videos. Some sources mention financial security testing (BCTC) certifications for its sensors, designed to meet demanding standards. AI adjusts the recognition to each user and speeds up the process, with the clear objective of opening without friction and with guarantees.
Alongside the palm vein and 3D facial recognition, there's an improved fingerprint sensor that remains practical and fast. You can also opt for passwords with different policies: long-term, temporary, or one-time use, ideal for visitors, rentals, or occasional services. The range is completed with remote unlocking from the app, Bluetooth with the mobile phone and, of course, the mechanical emergency key.
NFC is particularly well-designed: in addition to your smartphone, you can use compatible Xiaomi and Redmi watches or fitness trackers, and even access cards configured within the ecosystem. Those who prefer not to rely on their mobile device can opt for physical credentials and still maintain control. Ultimately, choose what is most comfortable and safest for each situation, which is precisely the beauty of having twelve options at hand.
- Advanced Biometrics: AI-powered palm veins, 3D face with life detection, fingerprint.
- Credentials and connectivity: PIN of various types, NFC (mobile, watch, bracelet, cards), Bluetooth, remote unlocking.
- Traditional support: emergency mechanical key.
An interesting feature is that the lock allows you to adapt the method to the context. For example, you can reserve facial recognition for household members, a temporary PIN for cleaning staff on Tuesdays, and the smartwatch's NFC for when you go for a run without your phone. This operational flexibility makes all the difference in day-to-day operations and avoids compromising safety for convenience.
Radar, silent locking, and an electrical system that won't let you down.
Security doesn't end with identification. The Smart Door Lock 4 Pro includes a 24 GHz millimeter wave radar (some sources cite 25 GHz in certain specifications) to detect human presence in front of the door and activate recording and notifications if someone is loitering. This radar works with the AI of the cameras to reduce irrelevant alerts and focus on what really matters.
The lock body features automatic and silent locking: when the door closes, the system engages smoothly and securely. The mechanical core is Class C, with anti-drill resistance, and is equipped with sensors that detect the door's status (closed, ajar) and panel tampering. If it is forced, if an attempt is made to open it improperly, or if there are multiple failed attempts, the app will notify you instantly.
- Door not closed or ajar.
- Panel manipulation or attempted forced entry.
- I loiter in front of the door.
- Multiple incorrect unlock attempts.
- Emergency assistance with fingerprint.
In terms of power, Xiaomi is opting for a hybrid approach so you won't be stranded outside due to a dead battery. There are references to two configurations: one with a 6.870 mAh lithium battery and another with a 5.000 mAh battery, both backed up by four AA batteries. The estimated battery life ranges from four to more than six months depending on the edition and usage, and the best part is that the system will automatically switch to batteries if the battery runs out.
For emergencies, both the exterior and interior modules have integrated USB-C ports, so you can power the lock with a power bank from either side. Continuous charging is also possible, if you prefer. In short: even in the event of a power outage or if you forget about the load, the door will still respond, which is what really matters.
The 3,97-inch "cat's eye" interior screen is more than just a digital peephole; it integrates with Xiaomi Home to display live video, review events, and allow interaction with the person on the other end. Some sources indicate that it can be linked to the brand's smart TVs and displays to answer calls, see who's calling, and remotely unlock the door if needed. That level of integration turns the door into a point of communication as well as security.
On the home automation front, the 4 Pro works seamlessly with Xiaomi Home and HyperOS Connect, opening the door—literally—to useful automations: turning on the hall lights upon entering, adjusting the climate control, deactivating the alarm upon recognizing a trusted user, or activating welcome voice messages. You can also configure security modes when you're away to strengthen detection and alert sending.
What about price and availability? The Smart Door Lock 4 Pro is sold in China with official prices that, according to various publications, start at 2.499 or 2.899 yuan (approximately €306-€354, with some references to €353-€350). There are mentions of a "dual camera edition" priced at 2.899 yuan and available for pre-order via Xiaomi Youpin. For now, its global launch is not confirmed and everything points to the fact that, if it does arrive, it could do so later or in limited runs, as has already happened with other locks from the brand.
It is important not to confuse this model with the Smart Door Lock M40 Pro, also seen in China, which integrates cameras and offers twelve unlocking methods, but features a 5-inch internal screen and an 8.000 mAh battery with four AA batteries. The 4 Pro is the star here: its offering balances dual cameras, cutting-edge biometrics, and a very careful integration into the Xiaomi ecosystem.
To complete the system, the Xiaomi Home app centralizes the experience: from your mobile device, you can view cameras in real time, play recordings, receive alerts, create temporary or one-time passwords, and manage user permissions. If you have other Xiaomi devices, the integration is seamless and benefits from automations and routines. Thus, each access point generates context for the rest of your connected home, with security as the starting point.
No, there are no half measures here: the Smart Door Lock 4 Pro aims to combine the best of surveillance and access control with a stylish design and long-lasting battery life. Its 3 MP main camera with wide-angle lens, 2 MP secondary sensor, dynamic night vision, mmWave radar, 12 unlocking methods—with palm vein and 3D face recognition as standouts—silent automatic locking, and integration with Xiaomi Home make it a serious contender for anyone seeking security, convenience, and a touch of smart home functionality in a single device. If you're wondering whether it's worth it: its performance/price ratio in China puts it far ahead of more expensive professional solutions, and that, these days, is hard to ignore.