Powered by advanced UWB technology, the Aqara Smart Lock U400 transforms your phone into a proximity-based digital key. No taps, no codes—just approach, and the lock verifies your presence in real time, unlocking with pinpoint accuracy. The future of seamless, intelligent access starts here.
Q: Does this lock have a low battery indicator?
A: Yes, this lock has a low-battery indicator.
Q: Does this smart lock offer remote monitoring capabilities?
A: Yes, this smart lock offers remote monitoring capabilities.
Q: Is this smart lock compatible with an app?
A: Yes, this smart lock is compatible with an app.
Q: Does this smart lock have auto unlock feature?
A: Yes, this smart lock has an auto unlock feature.
Q: Does this smart lock use a rechargeable battery?
A: Yes, this smart lock uses a rechargeable battery.
Q: Can I receive unlock notifications from this smart lock?
A: Yes, you can receive unlock notifications from this smart lock.
Q: Is the installation of this lock easy?
A: Yes, the installation is easy and takes as little as 5 minutes.
Q: Can this be installed on a metal door?
A: We don't recommend to install it on a metal door, it might affect the connection signal

Powered by advanced UWB technology, the Aqara Smart Lock U400 transforms your phone into a proximity-based digital key. No taps, no codes—just approach, and the lock verifies your presence in real time, unlocking with pinpoint accuracy. The future of seamless, intelligent access starts here.

Say goodbye to the hassle of fumbling with keys and welcome the seamless experience of unlocking your door with a simple touch of your iPhone or Apple Watch. By also fully supports the Apple Home app, including guest access code, gaining entry to your abode has never been easier or cooler. Even if there's a power outage of your Apple devices, you can still tap your device and enter your home effortlessly.

the first Matter-compatible leverset, perfect for various doors. It features fingerprint access, home key, and always-on mode, etc. Enhanced with AIoT and Thread protocol for seamless smart home integration, U300 combines quick, secure entry with robust connectivity. Upgrade the access with U300 for advanced security and convenience.

YALE ASSURE 2 TOUCH. A lock as unique as you. Make coming home more seamless with the Yale Assure Lock 2 Touch built-in Wi-Fi. Thanks to the new biometric keypad, a simple touch of your finger is all it takes. Explore multiple ways to access your home including hands-free Auto-Unlock, back-up key, or your phone or Apple Watch from anywhere
| Pros for Aqara - UWB Smart Lock U400 Kit with M100 Hub, Matter, Thread, Wifi, Apple Home Key, Fingerprint, Rechargeable Battery - Black | |||
|---|---|---|---|
| Build Quality | Ease of use, Installation, Design, Fingerprint Reader, Battery Life | Build Quality, Connectivity, Installation Ease, Fingerprint Reader Performance, Apple Home Key | Ease of use, Installation, Design, Connectivity, Overall Performance |
| Cons for Aqara - UWB Smart Lock U400 Kit with M100 Hub, Matter, Thread, Wifi, Apple Home Key, Fingerprint, Rechargeable Battery - Black | |||
| There were no cons for this product— | There were no cons for this product— | Locking Mechanism | Battery Life |
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
Easy install and setup and works great with my iPhone Air and Apple Watch Series 11. Walk right up to the door and it automatically unlocks. You also have the ability to share keys with other Apple users which is helpful for my kids. You can also utilize finger print and passcode. Has a rechargeable battery which is also a bonus as other locks I have used in the passed used regular AA batteries. Quality lock and highly recommend!
Mookie Posted
Upgraded from the U100 to the U400 and it’s a night and day difference. The build quality is a noticeable step up, and the new rechargeable battery pack is a huge improvement over swapping out AAs. Because it uses Thread, it's significantly faster and more responsive than the U100. The Apple Home UWB feature is the best part: it auto-unlocks entirely hands-free as you walk up. Highly recommend!
briggs Posted
Ultra wide band is the differentiator on this smart lock. No other locks currently on the market offer the ease of simply being able to walk up to your door and have it unlock without you touching anything. Maybe a minor inconvenience for some, but this is clearly the future of all smart locks. Install is super easy as well, and the fact that it comes with a threads hub in this kit of the the icing on the cake. If you’re looking for the BEST lock available in 2026, this is it
Patatta Posted