Aqara Smart Lock U400
Matter-certified Thread smart lock with UWB hands-free intent-based unlocking, Apple Home Key support, multiple access methods, auto lock via gyroscope, weather resistance, and a rechargeable battery.
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Information
| Maker | Aqara | |
| Category | Door Lock | |
| Status | released | |
| Product Page | https://us.aqara.com/products/smart-lock-u400 | |
| Date Announced | 2026-01-06 | |
| Date Released | 2026-01-06 | |
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on the relevant retailer site (including Amazon) at the time of purchase will apply to the purchase of this product. |
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The Aqara Smart Lock U400 introduces UWB (Ultra-Wideband) technology to home access, enabling precise, hands-free unlocking as an authorized user approaches the door. With centimeter-level location accuracy and spatial awareness, the lock unlocks only when someone is outside and intentionally arriving, reducing false or accidental unlocks. It is Aliro-ready, designed to work across future devices and platforms regardless of brand or operating system.
In addition to UWB access, the U400 supports multiple unlocking options, including NFC, fingerprint recognition, personal passcodes, mobile apps, voice assistants, and mechanical keys. Integration with Apple Home Key allows iPhone or Apple Watch users to unlock the door simply by approaching, without taking out their device.
Built on Thread and certified for Matter, the U400 works across major smart home ecosystems and does not require a dedicated Aqara hub. A built-in gyroscope enables automatic locking after the door is closed, while the weather-resistant design and rechargeable battery make it suitable for long-term outdoor use.
Supported Matter Capabilities
Full feature details →6 clusters across 3 categories · 8 features supported
Security
2 clustersAutomation & Scenes
1 clusterOther
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Specifications
| Manufacturer Part Number | AD051 | |
| Label | Aqara Smart Lock U400 | |
| Certification ID | CSA25G1YMAT49048-24 | |
| Latest Firmware Version | 3104 | |
| Matter Version | 1.4 | |
| Network | Thread, Matter over Wi-Fi, Bluetooth | |
| Thread Device Type | Full End Device | |
| Market | Consumer | |
| Software Versions |
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Firmware Version
The latest certified firmware version for this product.
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| Hardware Version | DVT | |
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Compliance Document
This is the official XML document certifying compliance.
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| Matter Specification Version | 1.4 | |
| Transport Interface | ||
| Primary Device Type ID | ||
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Firmware Version
The latest certified firmware version for this product.
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Compliance Document
This is the official XML document certifying compliance.
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| product.meta.csa_product_type | End Product | |
| UPC | 192784002131 | |
| GTIN | 0192784002131 | |
| MPN | DL-D06E | |