Aqara UWB Smart Lock U400

Quick verdict

Based on published specs and editorial comparison, the Aqara U400 in black is an entry-control device rather than a camera, built around Matter over Thread, Apple Home Key, and fingerprint keyless access. Its listed support for HomeKit, Alexa, Google, and Home Assistant plus a rechargeable battery makes ecosystem fit and tap-to-enter the deciding factors over any imaging spec. Best for Thread-equipped homes wanting a flush, multi-platform deadbolt with a discreet dark finish.

Good for

• Keyless entry with smart-home integration
• Local storage instead of cloud subscriptions

Not ideal for

• Buyers who want a fully professionally monitored service
• Setups where the needed features sit behind a subscription

Key buying points

• Resolution & night vision — Detail by day and color/IR clarity at night.
• Storage — Local (HomeBase/NVR) vs cloud, and any fees.
• Power — Wired, battery, or solar.

What to check before buying

• Confirm power option fits the install location
• Read what a subscription unlocks vs the free tier
• Confirm whether local storage is included or fee-based
• Check ecosystem support (HomeKit/Alexa/Google/Matter)

Editorially reviewed: May 2026. Product details may change on Amazon — check current details there.