Xiaomi Unveils Affordable Smart Door Lock with Facial Recognition

Key Takeaways

1. The Xiaomi Smart Door Lock M40 features multiple unlocking methods: facial recognition, fingerprint reader, and password, but lacks the palm vein recognition found in the Pro version.

2. It has dual cameras with a 190° view, including a 3MP camera for identifying people and a secondary camera for detecting packages.

3. The lock includes a 4.98-inch display for viewing visitors and can be controlled remotely via an app, with Bluetooth and Wi-Fi connectivity.

4. The device is priced at CNY 3,299 (~$464), which is CNY 500 (~$70) cheaper than the M40 Pro.

5. Availability outside China is uncertain, as Xiaomi has other products in Europe, but no confirmed release for the Smart Door Lock M40.

The Xiaomi Smart Door Lock M40 has officially launched in China. This smart home device comes out just after the more sophisticated Smart Door Lock M40 Pro, which debuted earlier in November 2025.

Unlocking Options

The Xiaomi Smart Door Lock M40 features multiple unlocking methods, including facial recognition, a fingerprint reader, and a password. The main distinction between the standard model and the Pro version is that the Pro has palm vein recognition. The latest model is equipped with dual cameras, offering a wide 190° view at your entrance. The primary 3MP camera provides a 175° angle, which is tailored for identifying people, while the secondary camera, at 128°, focuses on spotting objects like packages.

User-Friendly Interface

Inside the Smart Door Lock M40, there’s a 4.98-inch display that lets you see who is at your door without needing to open it. You can also control the smart lock remotely via the brand’s app. Furthermore, it supports Bluetooth and Wi-Fi connections and is expected to last around six months on a mix of lithium and AA batteries. Xiaomi claims that it has a fairly quiet automatic locking system, featuring a C-level lock cylinder and an integrated security sensor.

Pricing and Availability

In China, the Xiaomi Smart Door Lock M40 is priced at CNY 3,299 (~$464), making it CNY 500 (~$70) less expensive than the M40 Pro. It’s uncertain if or when this smart home device will be available in Europe, where the company already offers products like the Robot Vacuum X20+ (currently priced at €299.99 on Amazon DE).

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