Aqara UWB Smart Lock U400 Matter Over Thread Apple Home Key Fingerprint Keyless Entry Deadbolt Touchscreen Keypad Rechargeable

The Aqara U400 really changes the game when it comes to modern smart locks, especially with its ultra-wideband unlocking. It’s insanely fast, super smooth, and just works every time. I haven’t had a single issue since using it. It’s also a bit of a party trick—guests are always impressed when they see it unlock automatically, just like with the other smart features built into the lock. The locking and unlocking is noticeably quicker thanks to the updated motor. Even compared to the U100—which was already fast—this feels snappier and more precise. Everything about it feels solid and intentional. I’m also a big fan of the refreshed design. The U100 already looked modern, but the rounded edges on the U400 and the new anti-peep keypad (where the numbers stay hidden until you activate it) really give it a premium vibe. Another big win is the rechargeable battery. It’s just as reliable as the disposable batteries from the U100, but way more convenient. You can even hot-charge it, meaning you can plug it in and keep using it at the same time—huge plus. Feature-wise, it checks every box: facial recognition, fingerprint scanning, passcodes, NFC cards, automations, USB access, remote control, and even a physical key if you want it. Managing access is easy too, whether you’re setting up permanent users or temporary access for guests. Honestly, there’s not much to complain about. If I really had to nitpick, the lock is on the larger side—but that’s minor. If you’re shopping for a smart lock, this one pretty much ends the search. It does everything you’d want and then some. Another solid win from Aqara, and easily one of the best products in their catalog. Read more

Installation was easy, and unit works great. UWB unlocking is fantastic. Setting everything up was a little unintuitive from a software standpoint, but once figured out everything’s been straightforward and reliable. I love the design. The UWB auto-unlock and instant auto-relocking functions work fantastic. The motor is adequately strong for our needs. I really appreciate the rechargeable battery pack, which I’ve never seen in a smart deadbolt before. Fingerprint registering was a little finicky and troublesome but has worked great once setup. I’ve used closed to a dozen smart deadbolt locks over the past ten years and this is the first I’ve found that I think I’m completely satisfied with. Read more

Going to try again tomorrow but right now, it’s pretty useless. Initial setup seemed promising and it updated firmware after the battery charged a bit (it arrived below 20%) but then immediately lost binding with the Aqara hub and went no response in HomeKit. I reset all the Matter stuff and can’t seem to do anything with it. Bluetooth only stays connected for a few seconds before disconnecting, too. I don’t think the initial calibration worked properly either because the knob sits at about 45 degrees when it’s fully locked and the door open/close indicator is incorrect more often than not. The battery % and charging status wasn’t synchronized between Aqara app and Apple Home. No idea if UWB works because I couldn’t get to those settings before everything went wonky. I am going to reset the lock and try adding directly to Apple Home first and see if that works any better and will update my review based on those results. Aqara really needs to fix their sub-par Matter controllers. UPDATE: Added a star back because I was finally able to get it bound to Apple Home (after about 10 resets and pairing attempts) and connectivity has been solid for a couple days. UWB unlock on approach operates as expected. Calibration is still wonky where the motor doesn't extend the deadbolt as far as it can go, leaving the toggle switch just shy of horizontal. Manually turning the lock allows me to close it all the way. This is making me hesitant to put this thing on my main door. I've also noticed that my phone maintains a persistent bluetooth connection with the lock when I'm in the house. My understanding is this connection is a requirement for the UWB features, but I'm wondering if this will cause excessive battery drain over time. Battery percentage and active charging status does not update on the Apple Home accessory page with any amount of reliability so any notifications about low battery will likely arrive when its far too late. Getting really tired of this new technology cycle of feeling like a beta tester for products that I've paid full price for. Read more

My basic key pad lock gave up the ghost after many years of noble service, so I went for the upgrade with the Aqara U400. I'm so happy I did -- it is superb! Installation and set up was a breeze. I already have an Apple TV as my smart home hub, so all I had to do was point my iPhone camera at the QR code on the lock and click through the set up process in the Home app. Easy and quick. My favorite feature is the UWB that unlocks as I walk up to the door outside with my iPhone. It's crazy how nice and helpful this is. It's been fast and reliable, unlocking right before I reach for the door handle -- and it only unlocks from the outside. I thought I would like this feature, and it turns out I love it! Just don't forget: you also need a hub for this feature to work. I appreciate that it has a fingerprint reader if you want and physical keys just in case, but really, all I'm using is the UWB for myself and the key pad for guests. Build quality is excellent and connectivity has been great. The rechargeable battery is also great. And last but not least, locking and unlocking is super fast! All a big step up from my previous smart lock. This one has been a home run! Read more