The Aqara Smart Lock U400 is a game-changer, and here's why: it's the ultimate smart lock, offering an unparalleled experience with its Matter over Thread technology, HomeKey integration, and Ultra Wideband support. But is it worth the hype? Let's dive in and find out!
I've tested numerous smart locks, but the U400 stands out. Compared to its predecessors, the A100 Zigbee, U100, U50, and U200, the U400 is a significant upgrade. Despite the U300 being faulty, the U400 shines as the best Aqara lock I've reviewed, and possibly the best on the market.
The standout feature is Ultra Wideband (UWB) support. But what's the big deal? UWB allows your iPhone (series 11 and later, excluding budget models) to communicate with the lock, unlocking it automatically as you approach. It's like having a personal doorman with pinpoint precision, unlike Bluetooth's hit-or-miss accuracy.
Bluetooth has been the go-to for auto-unlock, but UWB is a game-changer. It's faster, more accurate, and smarter. It knows which side of the door you're on, ensuring it won't unlock if you're inside. No more accidental unlocks! Plus, it doesn't require you to leave a specific area before it reacts, a common Bluetooth limitation.
The packaging boasts a sleek Apple-style design, showcasing the lock and its impressive compatibility: Matter, Apple Home, Alexa, SmartThings, Google Home, and Home Assistant. Thread is also prominently featured, ensuring a seamless smart home experience.
The box highlights core specs, including wireless protocols (Thread, Bluetooth, NFC, UWB) and an IP65 rating for the external assembly. It also teases advanced features like hands-free unlock with HomeKey, rechargeable battery, and an advanced fingerprint reader.
However, some features are vague. The fingerprint reader's 'advanced' capabilities aren't clear, and 'auto-lock assurance' seems like a fancy term for auto-locking. An important detail is buried in the legal text: the U400 requires both a Matter controller and a Thread Border Router for full functionality.
Inside, you'll find the lock assemblies, a template for installation, a manual, two keys, a deadbolt kit, screws, and a rechargeable battery. Aqara's silence on spare battery availability is concerning.
Design-wise, the U400 is an evolution of the U100, with rounded corners and a sleek, dark appearance. The battery compartment is more accessible, a welcome improvement. The battery can be charged via the inner assembly's USB-C port or directly, though charging status isn't always accurate.
The U400 can be added to Aqara Home without a Matter controller or Thread Router, but control is limited to Bluetooth. Adding it to Aqara Home is straightforward, and you can later add it to Apple Home using the Matter QR code.
Installation is user-friendly, with a removable adaptor for smaller bore holes. Adding fingerprints is now possible directly on the keypad, a bold move by Aqara. The lock appears as a tile in Apple Home, with a toggle for locking/unlocking.
The settings offer a new 'Approach Direction' option, utilizing UWB to predict your approach direction. This is a game-changer for side entrances or apartment dwellers. The 'Manage Access' section lets you grant access to non-Apple Home members, and auto-lock settings are customizable.
The Aqara app provides more features, including detailed lock and door status, user management, and voice/sound adjustments. You can link devices like cameras and doorbells for a comprehensive security experience.
Auto-lock settings differ between Aqara and Apple Home, so choose one or the other. Aqara offers immediate locking and shorter delays, while Apple Home provides longer delays. Do Not Disturb mode reduces late-night sounds, and Matter settings, firmware updates, and automations are available.
In practical use, the U400 is best experienced firsthand. It's currently installed on an internal door, but its potential is clear. UWB is a significant upgrade over Bluetooth, offering a seamless and precise unlocking experience.
Bluetooth auto-unlock can be unreliable, as signal strength fluctuates. UWB, however, measures distance with centimeter-level accuracy, ensuring a quick and reliable unlock. It's faster, more accurate, and more secure.
The U400's reaction times are excellent, with minimal delays. Even if something goes wrong, you have multiple backup options, including HomeKey, fingerprint, keypad, NFC, traditional keys, and remote unlocking via Apple or Aqara Home.
The U400 is a winner, thanks to its UWB feature and improved design. HomeKey is great, but UWB adds another layer of convenience. Matter over Thread provides future-proofing and improved responsiveness, making it a worthwhile upgrade.
The price is higher, but if you're considering the U50 or U100, the U400 is a no-brainer. It's the ultimate smart lock, offering an unparalleled experience. Ultra Wideband support is the star, but it also boasts HomeKey, fingerprint, NFC, and wide compatibility.
The only con is the unavailability of spare batteries, which is a concern. Overall, the U400 is a smart lock powerhouse, and I highly recommend it.
Rating: 8.7/10
Breakdown:
- Build Quality: 8.5/10
- Design: 9.0/10
- Unlock Options: 9.0/10
- Compatibility: 9.0/10
- Price: 8.0/10
Pros:
- Ultra Wideband for precise unlocking
- HomeKey, fingerprint, and NFC support
- Improved design and easy battery recharge
- Wide compatibility
Cons:
- Spare batteries not available
And here's the million-dollar question: is the U400 the future of smart locks? Will UWB become the new standard? Share your thoughts in the comments, especially if you've had hands-on experience with this cutting-edge technology. The debate is open!
