Aqara UWB Smart Lock U400, Matter Over Thread, Apple Home Key, Fingerprint Keyless Entry Deadbolt,Touchscreen Keypad, Rechargeable Battery, Supports HomeKit, Alexa, Google, Home Assistant, Black
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Availability:
20 left in stock
Arrives
Mar 11 – Mar 12
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Color: Black
Features
- True Hands-Free Unlocking with UWB Technology: Experience a new era of smart access UWB (Ultra-Wideband) detects your incoming presence, direction, and intent to unlock automatically as you approach. It provides a faster, more convenient, and highly secure way to enter your home without touching the lock. Perfect when your hands are full, you're wearing gloves, or arriving in the rain. (Note: UWB unlocking requires a Thread-enabled Apple Home hub and is supported on Apple Watch Series 6 or later (excluding SE) running watchOS 11.5+ and iPhone 11 or later (excluding iPhone SE & iPhone 16e) running iOS 18.5+.)
- All-in-One Unlocking Options: Enjoy Apple home key tap-to-unlock (requires an Apple Thread-enabled Matter controller: HomePod 2nd Gen, HomePod mini, or Apple TV 4K 2021/2022), plus fingerprint, touchscreen passcode, voice assistant control, app remote access, NFC card support (card sold separately), and a physical key, giving you flexible, reliable ways to enter your home in any situation.
- Matter Over Thread for Multi-Ecosystem Compatibility: Built with Matter over Thread, the U400 can connect to multiple smart home platforms simultaneously, allowing you to enjoy the unique features of each ecosystem. Thread offers faster response, more stable connectivity, lower power consumption, and secure data transmission. Note: A Thread-enabled Matter controller from each ecosystem is required for its respective platform.
- Convenient Rechargeable Power System: Powered by a rechargeable and removable lithium battery that lasts up to 6 months per charge. Use the lock's USB-C port to recharge without taking the lock offline, or remove the battery and charge it separately. A low-battery voice alert will notify you when the battery drops below 20%, ensuring you never get caught off guard.
- Certified Security & Outdoor Durability: BHMA-certified for proven protection, mechanical strength, and long-term reliability. The IP65-rated exterior guards against dust and water for dependable outdoor performance. Plus, the rekeyable design allows you to change the physical key without replacing the entire lock cylinder.
- Unlock More Features with the Aqara App: Customize your security with Auto Lock, Night Latch Mode (only admins and physical keys can unlock at night), and Do Not Disturb Mode. Integrates seamlessly with Aqara cameras like the G5 Pro and G410 doorbell, allowing you to view visitors and unlock directly via live video interaction.
Brand: Aqara
Special Feature: UWB True Hands-Free Unlock
Lock Type: Deadbolt
Item dimensions L x W x H: 3 x 4.2 x 7 inches
Material: Aluminum
Brand: Aqara
Special Feature: UWB True Hands-Free Unlock
Lock Type: Deadbolt
Item dimensions L x W x H: 3 x 4.2 x 7 inches
Material: Aluminum
Recommended Uses For Product: Watch the complete video for installation, app pairing, and operation.
Color: Black
Number of Pieces: 1
Included Components: outer panel, inner panel, deadbolt, installation diagram, user manual, strike plate kit, mounting plate, adapter ring, mechanical key, mounting plate screwkit
Shape: Rectangular
Control Method: App
Connectivity Protocol: Matter
UPC: 192784002131
Model Name: U400
Manufacturer: Lumi United Technology Co., Ltd
Smart Home Compatibility: Smart Home Compatible
Item Weight: 3.39 pounds
Product Dimensions: 3 x 4.2 x 7 inches
Item model number: DL-D06E
Batteries: 1 Lithium Ion batteries required. (included)
Special Features: UWB True Hands-Free Unlock
Batteries Included?: Yes
Batteries Required?: Yes
Battery Cell Type: Lithium Ion
Date First Available: January 5, 2026
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Mar 11 – Mar 12
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Black
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.
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Reviewed in the United States on January 20, 2026 by Air
Color: Black
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.
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Reviewed in the United States on January 11, 2026 by Evan
Color: Black
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.
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Reviewed in the United States on January 8, 2026 by Phil
Color: Black
This smart lock has completely changed how I interact with my front door. My absolute favorite feature is the UWB auto-unlock — as I walk up to the house, the lock detects my presence and unlocks automatically before I even reach for the handle. It works flawlessly every time, which I wasn't sure I'd be able to say about a feature like this. The Apple Home Key integration is seamless if you're in the Apple ecosystem. I haven’t set up the fingerprint reader because its setup was a pain. It kept complaining that I was touching it incorrectly during setup. The setup was otherwise straightforward, and the build quality feels solid and premium.
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Reviewed in the United States on February 22, 2026 by JJ