Xiaomi Smart Door Lock 4 Pro Dual Camera explained: dual cameras, 3.97″ display, 6,870 mAh battery, 12 unlocking methods, HyperOS smart home integration and what it means for the future of smart locks.
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Xiaomi Smart Door Lock 4 Pro Dual Camera: Xiaomi’s Smart Lock Future, Explained
Xiaomi has quietly dropped one of the most advanced consumer smart locks on the market right now: the Xiaomi Smart Door Lock 4 Pro Dual Camera Edition.
This isn’t just another fingerprint lock with an app. It’s a full-blown smart door system with:
- Two cameras in the external module, including a 3 MP ultra-wide lens and a 2 MP secondary camera for low angles and packages
- An indoor 3.97-inch color display so you can see visitors like a built-in video door viewer
- Up to 12 unlocking methods, from AI palm-vein recognition and 3D face unlock to NFC, Bluetooth, PIN codes, access cards and a physical key
- A dual power system with a 6,870 mAh lithium battery plus 4 AA cells for around six months of battery life
- Deep integration with Xiaomi’s HyperOS Connect for smart home automations (lights, voice prompts, away mode, etc.)
Right now it’s officially China-only, selling for about 2,899 yuan (≈ $400) on Xiaomi Youpin and local channels. But it’s also an early preview of where Xiaomi wants to take smart locks globally – and it’s a shot across the bow for brands like August, Yale, Level, Eufy and Nuki.
Let’s break it all down.
1. Key Specs at a Glance
If you just want the “spec sheet view” of the Xiaomi Smart Door Lock 4 Pro Dual Camera, here it is:
- Model: Xiaomi Smart Door Lock 4 Pro Dual Camera Edition
- Price (China): 2,899 CNY (≈ $400–$410 at current exchange rates)
- Cameras (outside):
- Main: 3 MP, 160° wide-angle
- Secondary: 2 MP, 128° FoV for low-angle view (packages, children, pets)
- Night vision: Dynamic night vision with IR LEDs and automatic switch between color + IR modes
- Screen (inside): 3.97″ color display for real-time viewing and settings
- Sensors: 24 GHz mmWave radar for presence detection, full door-state sensors (open, closed, locked, tamper)
- Unlocking methods (up to 12):
- AI palm vein recognition
- AI 3D face recognition (with liveness detection)
- Fingerprint sensor
- Numeric PIN / passcode (permanent & temporary)
- NFC access (phones, watches, bands)
- Bluetooth unlock
- Remote unlock via app
- Access cards
- Mechanical key backup
- Plus several permission-based or one-time password modes
- Battery:
- 6,870 mAh lithium battery + 4× AA batteries
- Up to ~6 months use; USB-C ports on both units for emergency power
- Smart home:
- HyperOS Connect integration for automation with other Xiaomi devices (lights, air purifiers, speakers, cameras, etc.)
- Security:
- C-level anti-pry cylinder, tamper alarms, failed unlock alerts, video recording when someone lingers at the door
That spec list alone shows why people are calling this Xiaomi’s most advanced smart lock to date.
2. Design & Hardware: A Smart Lock That Looks Like a High-End Door Handle
Unlike some “DIY” smart locks that bolt onto the side of a deadbolt, the Xiaomi Smart Door Lock 4 Pro Dual Camera is a full replacement lock system designed to look clean and premium, not like a prototype.
Minimalist, Matte, and Modern
- The exterior module is tall and slim, with the camera pair integrated near the top and sensors plus fingerprint reader subtly placed near the handle.
- The finish is a dark, matte tone (black/graphite), which blends well with modern doors and doesn’t scream “expensive gadget” from the street.
- The interior module features the 3.97″ display, a simple lever, and a compact casing that hides the dual power system.
Everything about the design is very Xiaomi ecosystem: minimal logos, clean lines, and an emphasis on tech that disappears into the background.
Built for Real Front Doors, Not Just Bedrooms
This isn’t a bedroom lock – it’s built for front door security:
- It uses a C-level anti-pry mechanical cylinder, the highest standard in Chinese consumer smart locks, aimed at resisting common forced entry techniques.
- The door lock has automatic locking and state detection – it knows if the door is closed but not locked, or if someone is trying to mess with it.
That combination of hardware sturdiness plus smart detection is what separates this from cheap, no-name smart locks sold on generic marketplaces.
3. Dual Cameras: Turning a Smart Lock into a Smart Video Door System
Most smart locks in the U.S. either have no camera at all, or they rely on pairing with a separate video doorbell. Xiaomi decided to combine both worlds into one unit.
3 MP + 2 MP: Covering People and Packages
The Xiaomi Smart Door Lock 4 Pro Dual Camera uses two cameras on the exterior plate:
- Main Camera:
- 3 megapixels
- 160° ultra-wide field of view
- Captures the full height of visitors standing at the door
- Secondary Camera:
- 2 megapixels
- 128° field of view
- Angled for low-area coverage: packages, bags, pets, kids
Instead of one wide lens that distorts everything, Xiaomi opts for a multi-camera setup that more easily captures both people and stuff on the floor – a real pain point for package deliveries and porch theft.
Dynamic Night Vision
The lock also includes infrared LEDs and dynamic night vision:
- It automatically switches between full-color low-light mode and IR black-and-white depending on the lighting.
- Combined with AI, it can recognize people who linger near the door and start recording.
That makes it far more than a simple peephole camera; it’s effectively a smart video doorbell built into your lock.
Indoor Display: 3.97″ Screen as a Digital Peephole
On the inside, the 3.97-inch display becomes your always-on peephole replacement:
- Tap to see a live video feed from the cameras without reaching for your phone.
- See a timeline of recorded events (who came by, when someone rang, motion alerts).
- Control basic settings and check battery status at a glance.
If the door is close to your living room or hallway, this screen is arguably more useful in daily life than a separate wall-mounted smart screen.
4. Security & Biometrics: 12 Ways to Unlock, From Palm Veins to NFC
The headline number is 12 different unlocking methods. That sounds like overkill, but it lets each household member pick what feels most natural.
Palm Vein Recognition: Sci-Fi Level Biometrics
One of the most futuristic aspects is AI palm vein recognition:
- The lock uses near-infrared light to scan the blood vessel patterns in your palm.
- Those patterns are internal to your body and extremely hard to fake compared to a simple fingerprint.
- Xiaomi cites a false rejection rate under 0.001% and unlock times under one second in its marketing.
Palm vein scanning has traditionally been used in high-security enterprise systems. Seeing it in a consumer-grade Xiaomi lock is a strong hint of where biometrics at home are heading.
3D Face Recognition with Liveness Detection
The lock also offers 3D facial recognition using structured light and depth sensing:
- Works in low light and night conditions (with IR).
- Includes liveness detection to avoid being tricked by photos, videos or simple masks.
- Certified by financial-grade security labs in China (BCTC).
That means you can basically walk up to the door and have it unlock automatically once it recognizes you – like Face ID for your house.
Classic Biometrics and Codes
Beyond the futurism, you also get all the “standard” smart lock options:
- Fingerprint reader integrated in the handle area
- Numeric passcodes, both permanent and temporary
- Access cards for kids or visitors who don’t want to mess with apps
You can set specific users, limit time windows (e.g., cleaning staff, dog walker), and generate one-time codes for guests.
NFC, Bluetooth, Remote & Physical Key
And then there are the connectivity-based methods:
- NFC unlocking using Xiaomi / Redmi phones, smartwatches and bands – just tap your device to the lock.
- Bluetooth unlock through the Xiaomi Home app.
- Remote unlock from your phone if someone rings while you’re away (with video confirmation).
- Mechanical key backup, just in case all electronics fail or batteries die.
You will never lack ways to open the door. The real challenge will be deciding which ones to actually use day-to-day.
5. Power & Battery: 6,870 mAh + 4 AA Cells = Up to 6 Months of Use
Smart locks are useless if they die when you need them. Xiaomi clearly knows this.
Dual Power System
The Xiaomi Smart Door Lock 4 Pro Dual Camera uses a dual-mode intelligent power system:
- A 6,870 mAh lithium-ion battery pack as the primary source.
- Four AA alkaline batteries as a backup / redundancy layer.
This combo offers:
- Up to six months of typical use on a full charge under Xiaomi’s test conditions.
- Stable performance for the cameras, display, radar and biometric systems.
USB-C Ports for Emergency Power
Both the indoor and outdoor units include USB-C ports:
- If the lock is running low and you haven’t replaced or recharged, you can plug in a power bank temporarily.
- This is a smart safeguard for people who forget batteries until the last 1%.
Xiaomi also includes low-battery alerts in the app and on the screen so you’re not surprised.
6. HyperOS Smart Home Integration: Not Just a Lock, But a Trigger
Xiaomi isn’t just selling hardware – this lock is a HyperOS Connect node in your smart home.
HyperOS Connect Scenarios
With HyperOS Connect, the Xiaomi Smart Door Lock 4 Pro Dual Camera can:
- Turn on lights when it detects you approaching or when you unlock the door.
- Trigger a welcome scene (lights + music + heater/AC) when a trusted user arrives.
- Activate an away mode when the lock detects everyone has left and the door is locked (arming sensors, closing blinds, etc.).
This is what turns the lock from a gadget into the front gate of your entire smart home.
Integration with Xiaomi TVs and Smart Screens
According to reports from Chinese media and Xiaomi-focused sites:
- You can see visitor video feeds directly on Xiaomi smart TVs and smart displays.
- When someone presses the doorbell or lingers in front of the door, a PIP notification can pop up, letting you answer or unlock remotely.
For people invested in the Xiaomi ecosystem, this is a huge quality-of-life improvement.
7. Xiaomi Smart Door Lock 4 Pro Dual Camera vs Traditional Smart Locks
To understand how big this launch is, it’s worth comparing Xiaomi’s dual-camera lock to mainstream U.S. smart locks from brands like August, Yale, Schlage, Level, Eufy, Nest, etc.
What Xiaomi Does Better (On Paper)
- Built-in dual cameras: Many U.S. locks don’t have cameras at all, or force you to buy a separate video doorbell. Xiaomi gives you a video doorbell + lock in one.
- Palm vein and 3D face recognition: Most Western smart locks stop at fingerprint + keypad. Palm vein scanning is extremely rare in consumer devices.
- Indoor screen: Hardly any locks include a built-in screen on the inside to act as a digital peephole and control hub.
- Dual power architecture with large lithium pack + AA backup is more sophisticated than the single battery packs in many locks.
Where U.S. Brands Still Have the Edge
- Global availability: Today, Xiaomi’s Smart Door Lock 4 Pro Dual Camera is officially China-only. U.S. brands are easier to install legally and get support for in North America and Europe.
- Door standards and certifications: U.S. locks meet ANSI/BHMA standards and are tailored for American deadbolt formats. Xiaomi’s lock targets Chinese door standards and may not fit Western doors without heavy modification.
- Ecosystem compatibility: August, Yale and others integrate with Amazon Alexa, Google Home, Apple Home, Ring, etc. Xiaomi’s HyperOS is powerful but mostly centered on its own ecosystem.
If Xiaomi eventually brings this dual-camera lock officially to Europe or North America (or makes a global variant), it could seriously shake up the smart lock market.
8. Privacy & Security: Cameras at Your Front Door, AI in Your Lock
Putting AI cameras and biometric scanners at your front door raises understandable questions.
Local Processing & Encrypted Data
Chinese coverage and Xiaomi-oriented reviews emphasize that:
- Biometric data like palm veins and face templates are stored securely in the lock or its secure element, not as plain images in the cloud.
- Video footage and events can be stored locally, with the option (depending on region) to sync to Xiaomi cloud services.
For Western markets, Xiaomi would face additional scrutiny under GDPR and similar regulations, which is likely one reason this model is launching in China first.
Risk vs Reward
Realistically:
- Any smart lock and smart camera setup carries potential privacy and hacking risks.
- Xiaomi’s C-level cylinder, tamper alarms, and biometric redundancy make it much more secure than cheap imports, but buyers still need to trust the ecosystem.
If you’re in the U.S. or EU and planning to import, you should factor in:
- Where data is stored
- How firmware updates are delivered
- Whether you’re comfortable tying your front door to a cloud account outside your country
9. Who Is the Xiaomi Smart Door Lock 4 Pro Dual Camera For?
9.1 Tech-First Smart Home Users
If you already live in the Xiaomi ecosystem (phones, TVs, robots, cameras) and you’re comfortable importing Chinese-market hardware, this lock is:
- A natural centerpiece of your smart home
- A way to push your setup far beyond “just a smart bulb and speaker”
9.2 Early Adopters & Security Enthusiasts
If you love being ahead of the curve:
- Palm vein recognition + 3D facial unlock on your front door is about as “sci-fi” as consumer home security gets right now.
- The dual-camera plus display combo gives you doorbell + CCTV + lock in a single device.
9.3 People Who Want a Single, Integrated Door Solution
Instead of piecing together:
- A separate lock
- A separate video doorbell
- A separate indoor screen
…the Xiaomi Smart Door Lock 4 Pro Dual Camera offers a single integrated approach. If you like that “all-in-one” philosophy, this product is very appealing.
10. Downsides and Practical Limitations
This wouldn’t be a fair look at Xiaomi Smart Door Lock 4 Pro Dual Camera without mentioning its downsides.
- China-only (for now): Officially sold in China, configured for Chinese doors, and supported primarily in that market. Importing it elsewhere means DIY risk.
- Ecosystem lock-in: To really enjoy it, you need to embrace Xiaomi’s ecosystem (HyperOS, Mi Home app, Xiaomi accounts).
- Install complexity: Full replacement smart locks require more serious installation than “retrofit” options like August.
- Regulatory uncertainty: Privacy, data protection and wireless standards differ by country – future firmware updates and official support outside China are unclear.
For many U.S. users, it might still be smarter to use a local, certified smart lock brand today — but keep a close eye on Xiaomi’s next moves.
11. FAQ – Xiaomi Smart Door Lock 4 Pro Dual Camera
Is Xiaomi Smart Door Lock 4 Pro Dual Camera available globally?
Right now, no. It’s officially launched in China with sales on Xiaomi Youpin and other Chinese channels at around 2,899 CNY (about $400). There’s no confirmed global release date yet.
How many unlocking methods does it really have?
Xiaomi advertises up to 12 unlock methods, including:
- Palm vein recognition
- 3D face recognition
- Fingerprint
- Numeric passcodes (permanent / temporary)
- NFC
- Bluetooth
- Remote app unlock
- Access cards
- Physical key
…and several permission-/time-based combinations built on those technologies.
What’s special about the dual-camera setup?
The lock has:
- A 3 MP main camera with 160° FoV
- A 2 MP secondary camera with 128° FoV
Together, they cover full-height visitors and low-angle areas (packages, pets, children), with dynamic night vision and IR support. It turns the lock into a combined smart lock + video doorbell system.
How long does the battery last?
Thanks to its dual power setup — one 6,870 mAh lithium battery plus four AA batteries — Xiaomi claims up to six months of typical usage, with USB-C emergency power ports on both the indoor and outdoor units.
Does it work with Alexa, Google Home, or Apple HomeKit?
Official information so far focuses on HyperOS Connect and Xiaomi’s own smart home ecosystem. There’s no indication yet of native Alexa/Google/HomeKit support for this dual-camera edition. It’s clearly designed first for Xiaomi’s ecosystem.
Is it safe to use a camera-equipped smart lock?
From a hardware perspective, the Xiaomi Smart Door Lock 4 Pro Dual Camera combines:
- A high-grade mechanical cylinder
- On-device biometric processing
- Tamper alarms and video logging
However, as with any connected device, you should consider data privacy, firmware update policies and local regulations. Right now, the lock is meant first for the Chinese market, where Xiaomi can guarantee support and compliance.
Pros & Cons of the Xiaomi Smart Door Lock 4 Pro Dual Camera
Pros
- Dual-camera system (3 MP + 2 MP) with wide field of view and dynamic night vision gives you both visitor and package visibility in one device. Notebookcheck
- Built-in 3.97″ indoor display acts as a digital peephole and control panel, so you don’t always need your phone to see who’s at the door. Notebookcheck
- Up to 12 unlocking methods, including AI palm vein recognition, 3D face unlock, fingerprint, NFC, passcodes, Bluetooth, app unlock and a physical key backup. Notebookcheck
- Dual power system (6,870 mAh lithium + 4× AA) with USB-C emergency power and around 6 months of battery life under typical use. Notebookcheck
- Deep HyperOS Connect integration: can trigger lights, scenes, “away” modes and show video on Xiaomi TVs and smart screens.
- C-level anti-pry cylinder, tamper alerts, door-state sensing and auto-locking make it a serious security upgrade over basic smart locks. Notebookcheck
Cons
- Officially China-only for now; no confirmed launch for the U.S. or Europe, and import users must deal with door standard differences and limited support. Notebookcheck
- Designed around Xiaomi’s ecosystem (HyperOS + Xiaomi Home app); limited or no native Alexa/Google/HomeKit support at launch.
- Full replacement installation is more complex than retrofit deadbolt smart locks common in the U.S.
- Privacy and compliance questions remain for Western markets (biometrics + cameras on the front door, cloud options, regional regulations).
- Price around CNY 2,899 (~$400+) puts it near or above many established Western smart locks that already work natively in the U.S. and EU.
Xiaomi Smart Door Lock 4 Pro Dual Camera – Review Summary Box
Overall score (editorial): ⭐ 4.6 / 5
Score based on specs and early hands-on coverage from Chinese and international tech media. Official global user ratings are not yet available because the product is currently China-only. Notebookcheck
What reviewers and early adopters love
- Hardware is way ahead of typical smart locks: dual cameras, radar sensor, palm vein and 3D face recognition all in one product are repeatedly highlighted as “overkill in a good way” for home security.
- Battery + power design gets praise: six-month runtime plus AA backup and USB-C emergency power is seen as a big reliability win compared with many battery-only locks. Notebookcheck
- Video quality and field of view are described as a major upgrade over older single-camera locks, especially for seeing packages at the doorstep as well as faces.
- HyperOS automation and Xiaomi Home app integration make it feel like a true “front door hub” instead of just a lock with Wi-Fi.
Main complaints and concerns
- Availability & support: most reviewers note that it’s limited to China, so international buyers would face warranty, language and door-compatibility headaches. Notebookcheck
- Ecosystem lock-in: tech sites point out that it’s fantastic if you’re all-in on Xiaomi, but less attractive if your home is built around Alexa, Google Home or HomeKit.
- Privacy worries: some coverage raises questions about how comfortable Western users will be with always-on cameras and advanced biometrics directly on the main door, especially given regional regulations.
Bottom line from early reviews
If you live in Xiaomi’s core markets and already use a lot of Xiaomi gear, the Xiaomi Smart Door Lock 4 Pro Dual Camera is being described as one of the most complete and futuristic smart locks you can buy right now. For U.S. users and high-AdSense countries, it’s more of a preview of where the smart lock market is going than an easy “buy it today” product – but it sets a very high bar for whatever Xiaomi eventually brings to the global market.
Final Takeaway
The Xiaomi Smart Door Lock 4 Pro Dual Camera is one of the most advanced consumer smart locks we’ve seen: dual cameras, palm vein and 3D face recognition, a built-in display, six-month battery life and deep HyperOS integration.
For now, it’s a China-only showcase of what Xiaomi can do. But if – or when – Xiaomi brings a global version to the U.S. and high-value AdSense markets, it could dramatically change what we expect from a “normal” smart lock.
Until then, this model is a fascinating preview of the future of home security: smarter, more integrated, and packed with AI – right on your front door.
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