Aqara U400 review: UWB home key will be hard to beat

The newly launched Aqara U400 is the first — and so far only — smart lock with Ultra Wideband Home Key support, and after using it for the past month, I don't think I can go back. Aqara U400 review: The first UWB smart lock I firmly believe that smart locks are one of the best smart home devices you can add to your home. Not only do they offer unparalleled convenience of unlocking or locking your home from anywhere, but they also add peace of mind.