Aqara Smart Lock U400

Matter 1.4 certificate

Its certificate, CSA25G1YMAT49048-24, is for Matter 1.4, certified Dec 16, 2025. The Matter version is the specification version on the certificate's ledger record.

Source: CSA Distributed Compliance Ledger, read Oct 31, 2026.

Certified software versions

The CSA ledger lists 3 certified software versions for the device on certificate CSA25G1YMAT49048-24. The most recent is software 3110, certified Jun 2, 2026, for Matter 1.4. The certificate this page shows covers software 3104, certified Dec 16, 2025, for Matter 1.4.

• Software 3110 · certified Jun 2, 2026 · Matter 1.4 · CSA263LDMAT54065-24
• Software 3104 · certified Dec 16, 2025 · Matter 1.4 · CSA25G1YMAT49048-24 · this page's certificate
• Software 3100 · certified May 7, 2025 · Matter 1.4 · CSA2523EMAT45456-24

Certification covers each software version listed. It does not establish the software on a unit you buy.

Source: CSA Distributed Compliance Ledger, device record (vendor ID 4447, product ID 10244), read Oct 31, 2026.

Quick answers

Is the Aqara Smart Lock U400 Matter certified?

Yes. MatterCatalog matches it to CSA Matter certificate CSA25G1YMAT49048-24, certified Dec 16, 2025.

Does the Aqara Smart Lock U400 work with Apple Home or HomeKit?

Yes. The maker’s own site names Apple Home, and it is Matter certified (certificate CSA25G1YMAT49048-24). Apple says an iPhone using iOS 18 or later can add Matter accessories to the Home app without a home hub. A Thread accessory needs a Thread-enabled home hub such as an Apple TV 4K, HomePod (2nd generation) or HomePod mini, or a compatible third-party Thread border router. Apple’s Matter page lists locks among the accessory types the Home app supports.

Add a Matter device to Apple Home

Does the Aqara Smart Lock U400 work with Google Home?

Yes. The maker’s own site names Google Home, and it is Matter certified (certificate CSA25G1YMAT49048-24). Google says you need a Matter-enabled hub device set up on your home wireless network before you can add Matter devices to Google Home. A Thread device needs a hub that is also a Thread border router: Google Home Speaker (2026), Nest Hub (2nd gen), Nest Hub Max, Nest Wifi Pro (Wi-Fi 6E) or Google TV Streamer (4K). Google’s supported-device-types page lists the Door Lock type.

Add a Matter device to Google Home

Does the Aqara Smart Lock U400 work with Alexa?

Yes. The maker’s own site names Alexa, and it is Matter certified (certificate CSA25G1YMAT49048-24). Alexa needs a Matter-compatible Echo; Amazon says its Echo devices support “a subset of Matter 1.5 and lower device types”, so check that yours does. A Thread device needs an Echo with a built-in Thread border router, such as the Echo (4th Gen) or Echo Hub.

Add a Matter device to Alexa

Does the Aqara Smart Lock U400 work with Samsung SmartThings?

Yes. The maker’s own site names SmartThings, and it is Matter certified (certificate CSA25G1YMAT49048-24). SmartThings adds Matter devices through the SmartThings app and a Matter controller. Samsung says a Thread device needs a Matter controller that includes a Thread border router; the latest SmartThings Hub, SmartThings Station, Samsung TVs and Samsung Family Hub refrigerators have a Thread border router built in.

Add a Matter device to SmartThings

Does the Aqara Smart Lock U400 work with Home Assistant?

Yes. The maker’s own site names Home Assistant, and it is Matter certified (certificate CSA25G1YMAT49048-24). Home Assistant says: “Adding a new Matter device only works in the Home Assistant Companion app.” A Thread device needs a Thread border router, which Home Assistant describes as a network device that connects a Thread mesh network to other IP networks such as Ethernet or Wi-Fi.

Add a Matter device to Home Assistant

Does the Aqara Smart Lock U400 use Thread or Wi-Fi?

Thread. Its catalog record lists Thread, and Matter devices that use Thread need a Thread border router in the home, in addition to your platform’s Matter controller.

Does the Aqara Smart Lock U400 need a hub or a Thread border router?

Yes: a Thread border router, in addition to your platform’s Matter controller. A Thread border router connects Thread devices to your home network; Apple TV 4K, HomePod mini, Nest Hub (2nd gen) and Echo (4th Gen) are examples, and each platform lists its own.

Which devices are Thread border routers

When was the Aqara Smart Lock U400 Matter certified?

The CSA certified it on Dec 16, 2025 (certificate CSA25G1YMAT49048-24). That is its certification date, not a retail release date, which MatterCatalog does not state.

Where can I buy the Aqara Smart Lock U400?

MatterCatalog has verified store links for it at Amazon and Aqara. Check the current price, model and pack size at the store.

From this product’s catalog record, not hands-on testing. Editorial policy