Aqara U400 UWB Fingerprint Smart Lock
- UWB hands-free unlock with iPhone 11 or later and Apple Watch Series 6 or later
- Matter over Thread, works with HomeKit, Alexa, Google, Home Assistant, SmartThings
- Up to 6 months per charge, removable rechargeable lithium battery
- USB-C charging in place, voice alert below 20%
- IP65 exterior, BHMA certified, rekeyable cylinder
- Fingerprint, passcode and Apple Home Key, plus NFC card, app, voice and key
- Thread hub required for UWB and Home Key unlocking
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A strong choice for Apple households that already run a Thread hub and want true hands-free entry. Without that hub and a recent iPhone or Watch, the signature unlock feature does not work.
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ASIN: B0FRS6T6HLModel: U400Category: Deadbolts
Overview
Walking up to the door with an iPhone or Apple Watch is enough for the Aqara deadbolt to sense your approach and unlock using ultra-wideband. It replaces a standard deadbolt with an aluminum outer panel and an inner panel, and talks to several smart home platforms over Matter and Thread.
Hands-free ultra-wideband entry is what sets this Aqara apart, and it layers on fingerprint, code, Home Key and a real key, so one failed method never locks you out. How much you get depends on owning recent Apple gear and a Thread controller, and the listing never states door thickness or backset.
Who it's for
Suited to a front door used with arms full of groceries, in a home already built around Apple Home and a HomePod or Apple TV. Android-only households, or homes without a Thread controller, lose the hands-free feature and should weigh a simpler keypad lock.
Pros and cons
- Unlocks hands-free as you approach
- Charges by USB-C while staying on the door
- Battery removes for separate charging
- Works with several smart home platforms at once
- Door thickness and backset not listed
- UWB needs a Thread Apple Home hub
- NFC card sold separately
- UWB excludes iPhone SE and Apple Watch SE
Performance notes
Unlock timing comes from ultra-wideband ranging, which reads the distance, direction and intent of the phone or watch, and from Thread, which the listing credits with faster response and lower power draw. Battery life depends on how often the bolt is thrown and how busy the radio is, and the removable cell means a flat battery never takes the lock offline for long.
Specifications
| Brand | Aqara |
|---|---|
| Model | U400 |
| Power & efficiency | |
| 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. |
| Compatibility & installation | |
| 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. |
| Other details | |
| 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. |
| 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. |
| 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+.) |
| 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. |
Frequently asked questions
Will Aqara U400 hands-free unlock work with an iPhone SE or Apple Watch SE?
No. UWB unlocking excludes iPhone SE, iPhone 16e and Apple Watch SE. It needs an iPhone 11 or later on iOS 18.5+ or an Apple Watch Series 6 or later on watchOS 11.5+, plus a Thread-enabled Apple Home hub.
Which hub does the Aqara U400 need for Apple Home Key?
Tap-to-unlock Home Key requires an Apple Thread-enabled Matter controller: HomePod 2nd Gen, HomePod mini, or Apple TV 4K 2021/2022.
Is the Aqara U400 a Wi-Fi smart lock?
No Wi-Fi is listed. It connects with Matter over Thread, and each smart home platform needs its own Thread-enabled Matter controller.
Can I charge the Aqara U400 without taking it off the door?
Yes. The USB-C port charges it in place without taking the lock offline, or you can remove the lithium battery and charge it separately.
Does the Aqara U400 come with an NFC card?
No. NFC card support is listed, but the card is sold separately. The box includes the panels, deadbolt, strike plate kit, mounting plate, adapter ring, mechanical key and screw kit.