Aqara · Reviewed by TechMagnet · Published 2026-05-26
Based on a review by TechMagnet (accessed 2026-05-26).
Based on this review alone: buy it if you care about truly hands-free unlocking on approach using ultra-wideband (uwb) — just accept repetitive voice prompts during fingerprint setup.
The reviewer concludes that the Aqara U400 offers 'everything,' praising its 'great unlock on approach,' 'beefed-up security,' and 'thoughtful USB port on the outside' for emergency power. They particularly appreciate the voice commands.
This review unboxes and demonstrates the Aqara U400 smart lock, covering its installation process on a fake door and its integration with the Aqara Home app and Apple Home. It explores various unlocking methods and essential features.
The Aqara U100 Smart Lock provides a truly hands-free unlocking experience, making it a highly recommended choice for those seeking seamless smart home integration and enhanced convenience. The ultra-wideband protocol enables automatic unlocking upon approach, a significant improvement over previous smart lock implementations, and its BHMA certification ensures durability and reliability. A minor drawback is the repetitive voice feedback during fingerprint setup, which could be improved for a smoother user experience. If you prioritize truly hands-free access and broad smart home compatibility, this smart lock is an excellent investment. If you are sensitive to repetitive voice prompts during initial setup, you might find that part slightly annoying, but it doesn't detract from daily use.
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The reviewer states the Aqara U400 is one of the first ultra-wideband enabled smart locks on the market and is Matter-ready.
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The smart lock works with all major home integration solutions including Amazon Alexa, Apple Home, Google Home, Samsung SmartThings, and Home Assistant.
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The reviewer shows the product box, which clearly indicates the lock is BHMA certified for durability and reliability.
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The reviewer unboxes the Aqara U400, showing its 4880 mAh rechargeable battery, which can be charged via Type-C.
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The reviewer demonstrates how the deadbolt can be adjusted for either 60mm or 70mm distances from the center hole to the door edge, adjusting it for his 60mm fake door.
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The reviewer demonstrates the full installation process of the smart lock on a fake door, following the quick start guide.
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The reviewer goes through the setup process in the Aqara Home app, successfully pairing the lock and enrolling a fingerprint.
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The reviewer calibrates the door lock using the Aqara Home app, which involves opening and closing the door for the lock to find its optimal working range.
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The reviewer demonstrates the auto-lock feature by closing the door, and after three seconds, the lock automatically engages.
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The reviewer successfully adds the Aqara U400 to Apple Home, enabling the Home Key feature with 'express mode' for automatic unlocking on approach.
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The reviewer uses Siri to lock the front door via voice command, demonstrating successful integration with Apple Home voice control.
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The reviewer demonstrates the fingerprint reader, noting that it works 'super fast' to unlock the door.
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The reviewer demonstrates that the lock can still be unlocked with traditional keys or by providing emergency power via a USB-C port using a phone with reverse power delivery or a power bank.
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The reviewer mentions the 4880 mAh battery can last up to 6 months and users will receive a notification when the battery reaches 20%.
The reviewer highlights the U400's ultra-wideband protocol for hands-free unlocking, describing it as a safer and more convenient approach. They demonstrate setting up "express mode" with Apple Home Key, which allows the door to unlock automatically as you get close.
The review explicitly states the U400 is Matter-ready and built on Thread, ensuring broad compatibility. It directly mentions support for Apple Home, Amazon Alexa, Google Home, Samsung SmartThings, and Home Assistant, with the reviewer demonstrating Apple Home integration.
The reviewer demonstrates several unlocking methods: a "super fast" fingerprint reader, using a set keypad code, traditional physical keys, Apple Watch with Home Key, and voice commands through Siri. The primary hands-free method is via ultra-wideband as you approach.
The reviewer specifies the battery capacity as 4880 mAh and states it can last for up to 6 months. It charges via a Type-C port, and the Aqara app and Home app will notify users when the battery reaches 20%.
The reviewer addresses this concern directly, showing that physical keys are always an option. Additionally, there's a USB-C port on the bottom of the lock where you can connect a phone with reverse power delivery or a power bank to temporarily power the lock and gain entry.
The reviewer demonstrates the auto-lock feature, showing how it can be enabled and configured within the Aqara Home app. They set it to a 3-second delay and successfully show the lock engaging automatically after closing the door.
85/100 source quality
The TechMagnet channel reviews the Aqara U400 smart lock, highlighting its ultra-wideband (UWB) hands-free unlocking, Matter-readiness, and compatibility with major smart home platforms like Apple Home, Alexa, and Google Home. The review showcases the unboxing, installation on a demo door, and setup with the Aqara Home and Apple Home apps. It also demonstrates multiple unlocking methods, including fingerprint, keypad, physical key, Apple Watch, and voice commands via Siri, while also pointing out useful features such as auto-lock, emergency battery options, and battery notifications.
Full transcript is not redistributed here to respect the original creator’s rights.
This page converts TechMagnet's review of the Aqara Aqara U100 Smart Lock into structured evidence — timestamped claims, pros & cons, and buyer questions. It is not the original review and does not replace watching or reading the full source.
Brand relationship disclosed as: affiliate