Aqara UWB Smart Lock U400

Quick verdict

Based on published specs and editorial comparison, this is the silver-finish variant of the same Aqara U400 smart lock, identical in its Matter-over-Thread, Apple Home Key, and fingerprint entry feature set per its listing. The distinction is purely aesthetic, suiting hardware schemes where a lighter deadbolt face fits the door better. Choose between the two strictly on finish, since ecosystem support and access methods are the same.

Good for

• Local storage instead of cloud subscriptions
• No-monthly-fee outdoor camera coverage

Not ideal for

• Locations without a suitable power option for the device
• Buyers who want a fully professionally monitored service

Key buying points

• Power — Wired, battery, or solar.
• Smart-home fit — HomeKit, Alexa, Google, Matter/Thread support.
• Subscription terms — What features are locked behind a plan.

What to check before buying

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

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