Xiaomi Smart Door Lock M40 Pro launched with AI palm vein recognition, 5-inch screen & HyperOS
Xiaomi has launched the new Smart Door Lock M40 Pro, a high-end security product designed for smart homes in the Chinese market. The device is now available for pre-order at a discounted price of 3,229.15 yuan ($453). The official retail price is set at 3,799 yuan ($533).

Xiaomi M40 Pro Specifications
The M40 Pro integrates AI-powered palm vein, 3D structured-light facial, and fingerprint recognition. The palm vein system uses near-infrared light to read subcutaneous patterns for secure, contactless access. Its facial recognition meets BCTC financial-grade standards with live detection, while the fingerprint sensor employs a self-learning algorithm that enhances accuracy over time.
The M40 Pro features a dual-camera panoramic peephole with a 3MP main sensor (175°) and a 2MP auxiliary lens (128°), offering a 190° field of view. Its AI system detects people, packages, and unusual activity. Inside, a 5-inch HD interior display shows real-time footage, which can also stream to Xiaomi TVs, smartphones, and the SU7 car.
The M40 Pro supports 12 unlocking methods, including palm vein, AI 3D structured-light facial recognition, fingerprint, Bluetooth, NFC, passcodes, Mi Home remote unlock, and physical keys. It uses a direct-insert C-grade lock cylinder with through-body construction for stronger physical security, and sensors monitor whether the door is ajar, forcibly opened, or left unlocked.

The device supports a dual power supply system. It uses an 8000mAh rechargeable lithium battery that can last up to 4.5 months, while four AA alkaline batteries serve as a backup for up to 6 months. It includes both internal and external Type-C ports for emergency power and supports reverse wireless charging from compatible smartphones.
For connectivity, it includes Wi-Fi 6, Bluetooth 5.3, and NFC. It integrates with Xiaomi’s HyperOS ecosystem, allowing automation features like triggering lights, climate control, or surveillance systems upon unlocking. The lock supports app-based alerts for low battery, tampering, and abnormal temperature.
Xiaomi also includes WeChat support for video and voice intercom to enable smooth two-way communication. The lock comes in a brushed metal finish with an ergonomic layout that combines durability and comfort.
In related news, Xiaomi recently launched a new sterilizer that offers a premium design, all-in-one cleaning, and a price under $150. The company has also introduced a smart foot spa that heats, massages, sterilizes, and folds for easy storage.
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