# Aqara Smart Lock U400

Aqara Smart Lock U400 is the premium direct Matter-over-Thread Aqara lock, especially if you have the Apple hardware needed for its UWB auto-unlock story. Buy it for a compatible door and clear access needs, not just because it has the longest feature list.

Canonical page: https://matterhome.io/devices/aqara-smart-lock-u400
Markdown page: https://matterhome.io/devices/aqara-smart-lock-u400.md

## Device Facts

- Brand: Aqara
- Model: Smart Lock U400
- Product type: Matter-over-Thread Deadbolt Smart Lock
- Category: Locks
- Connection: Matter over Thread
- Matter status: Aqara lists Smart Lock U400 with Matter over Thread support and direct integration with Apple Home, Google Home, Alexa, SmartThings, and Home Assistant.
- Launch date: 2026-01-06
- Thread border router required: Yes
- Brand hub required: No
- Typical price range: $270
- Review status: Compatibility guide
- Product image: https://matterhome.io/content-assets/devices/aqara-smart-lock-u400/product.png
- Product image alt text: Aqara Smart Lock U400
- Product image source: https://us.aqara.com/cdn/shop/files/1767600360875_DA4-_-_-uwb.png?v=1767686807

## Ecosystem Support

- Apple Home: Supported
- Google Home: Supported
- Alexa: Supported
- SmartThings: Supported
- Home Assistant: Supported

## Best For

- Buyers who want Aqara's higher-end direct Matter lock
- Apple homes that meet the UWB auto-unlock requirements
- Doors where a full smart lock replacement makes sense

## Skip If

- You only need a simpler retrofit lock
- Your Apple hardware does not support the UWB features you want
- You need identical lock administration across every Matter ecosystem

## Setup Notes

- Confirm door and deadbolt compatibility before buying.
- Pair over Thread for direct Matter ecosystem control.
- If buying for UWB auto-unlock, check supported Apple devices, home hub requirements, and software versions first.

## Known Limitations

- Matter lock support can differ for PINs, users, logs, and advanced access rules.
- UWB auto-unlock is not a generic Matter feature.
- Aqara app features may still be needed for full setup and management.

## Pros

- Native Matter-over-Thread smart lock
- Adds UWB auto-unlock features for compatible Apple hardware
- Supports multiple access methods including keypad and app control
- Designed for direct Matter ecosystem integration

## Cons

- Requires a Thread-enabled Matter controller
- UWB auto-unlock has specific Apple hardware and software requirements
- Advanced lock management can vary by ecosystem

## Sources

- https://us.aqara.com/products/smart-lock-u400
- https://www.aqara.com/us/product/smart-lock-u400/
- https://us.aqara.com/cdn/shop/files/1767600360875_DA4-_-_-uwb.png?v=1767686807

## Aqara's premium direct Matter lock

The Aqara Smart Lock U400 is the high-end lock in this Aqara direct Matter set. It uses Matter over Thread for ecosystem integration and adds UWB auto-unlock features for supported Apple hardware.

That does not make it the automatic choice for every door. It is a different form factor and a more expensive buy than the U200 retrofit lock or U300 lever lock.

## Why the requirements matter

The U400 should be evaluated in layers. First, does it fit the door? Second, do you have a Thread-enabled Matter controller near the entry? Third, if UWB auto-unlock is the reason you are interested, do your Apple devices and home hub meet Aqara's requirements?

If any of those answers is no, the feature list gets less persuasive.

## What Matter covers

Matter should give you direct lock control in major ecosystems, but lock administration remains one of the places where platform differences matter. PINs, users, logs, notifications, and advanced access rules may not behave identically everywhere.

Set up the lock with Aqara's tools, pair it to your Matter ecosystem, and test normal entry, backup entry, and automations before trusting it fully.