Xiaomi Smart Door Lock 4 Pro Dual Camera Edition Brings AI Palm Unlock and HyperOS Integration

Xiaomi just gave your front door a futuristic upgrade. The brand has officially launched the Smart Door Lock 4 Pro Dual Camera Edition in China, an advanced smart lock that combines AI-powered palm recognition, dual cameras, and HyperOS smart home integration. Priced at 2,899 yuan (around $407), it’s now open for pre-orders on Xiaomi Youpin.

At first glance, the Smart Door Lock 4 Pro Dual Camera Edition looks like any other high-end door lock — sleek, minimal, and built to blend with modern interiors. But under the surface, it’s packed with technology that feels straight out of a sci-fi home. The highlight is AI palm vein recognition, which uses near-infrared light to detect the unique pattern of veins beneath your skin. Xiaomi claims it’s so precise that the false rejection rate is less than 0.001%, and it unlocks in under one second. For extra flexibility, the lock also supports AI 3D face recognition, certified by the BCTC Financial Security Test, and capable of identifying users even in low-light conditions thanks to 3D liveness detection that prevents spoofing via photos or videos.

On the outside, the lock is equipped with a dual-camera peephole setup — a 3MP main camera with a 160° ultra-wide view and a secondary 2MP lens with a 128° field of view. Together, they provide a complete picture of what’s happening outside your door — whether it’s a visitor ringing the bell or a delivery package left at your feet. The system also features dynamic night vision with five infrared LEDs that automatically switch between color and infrared mode depending on ambient light. There’s even a 24GHz millimeter-wave radar sensor that detects nearby motion and records video automatically when someone lingers outside too long.

Inside, you’ll find a 3.97-inch display that acts like a mini home security screen, letting you monitor visitors in real time. But the true magic happens when it connects with your other Xiaomi devices. Using Mi Home and HyperOS Connect, the lock can link to Xiaomi TVs, smartphones, and smart displays, allowing you to answer door calls, view live footage, and unlock remotely. It also supports up to twelve unlocking methods, including palm vein, 3D face, fingerprint, NFC, Bluetooth, remote unlocking, and even mechanical keys. The NFC feature works seamlessly with Xiaomi and Redmi smartphones, smartwatches, and bands — one tap and you’re home.

Powering all of this is a dual power system combining a 6,870mAh lithium battery with four AA batteries, offering up to six months of use per charge. Both indoor and outdoor units include USB-C ports for emergency power or continuous charging. Xiaomi has also added C-level anti-pry locks, door state sensors, and tamper alerts, ensuring security is never compromised.

But beyond the specs, this door lock represents Xiaomi’s growing vision of a fully integrated smart home. With HyperOS Connect, the Smart Door Lock 4 Pro can trigger automated lighting, welcome voice prompts, or even switch to away mode when you leave the house. It’s the kind of ecosystem-level thinking that makes smart living feel truly seamless — and very much aligned with Asia’s fast-moving connected home culture.

In short, Xiaomi’s Smart Door Lock 4 Pro Dual Camera Edition isn’t just about security; it’s about redefining what “coming home” feels like in the era of AI and automation. It’s your doorman, security guard, and home assistant — all built into your front door.