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.

Aqara u400 smart lock

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Information

MakerAqara
CategoryDoor Lock
Statusreleased
Product Pagehttps://us.aqara.com/products/smart-lock-u400
Date Announced2026-01-06
Date Released2026-01-06

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.

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Specifications

Manufacturer Part NumberAD051
LabelAqara Smart Lock U400
Certification IDCSA25G1YMAT49048-24
Latest Firmware Version3104
Matter Version1.4
Network Thread, Matter over Wi-Fi, Bluetooth
Market Consumer
Software Versions
  1. 3104 Latest

    Certificate: CSA25G1YMAT49048-24

    Download Firmware Checksum: bsCl0+E8ntp1LFKpJzfM7fUVFM4z7BlD7xPylbDRe2w=
  2. 3100

    Certificate: CSA2523EMAT45456-24

Firmware Version
Hardware Version DVT
Compliance Document
Matter Specification Version 1.4
Transport Interface
Primary Device Type ID