Aqara · Reviewed by Rebecca Brand · Published 2026-07-08
Based on a review by Rebecca Brand (accessed 2026-07-08).
Based on this review alone: buy it if you care about hands-free unlocking with uwb technology from 3 feet away (works with phone in pocket/purse) — just accept uwb hands-free unlocking requires specific apple home hub and compatible iphone or apple watch models.
The reviewer highly recommends the Aqara Smart Lock U400, calling it "a smart lock" with "innovations in smart home technology" and praising its convenience features like hands-free unlocking and automatic locking, as well as its security and management capabilities.
This review provides an unboxing, installation guide, and feature demonstration of the Aqara Smart Lock U400, which the reviewer consistently refers to as the U100. It covers hands-free unlocking, auto-lock, voice control, emergency charging, user code management, and weather resistance, concluding with an installation walkthrough.
The Aqara U400 Smart Lock offers exceptional convenience and robust security features, making it a highly recommended smart lock for Apple Home users. Its hands-free UWB unlocking allows entry from 3 feet away without touching the lock, even with hands full, while auto-lock ensures the door is always secured after leaving. The Matter over Thread support integrates seamlessly with various smart home ecosystems and includes an emergency USB-C charging port for power outages. If you prioritize effortless entry, advanced security, and seamless integration with Apple Home, this smart lock is an excellent choice. However, if UWB unlocking is a primary draw, confirm compatibility with your specific iPhone or Apple Watch model beforehand.
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hands_on_demopositivet=00:23–01:21
The reviewer demonstrates the Aqara Smart Lock U100 opening automatically upon her approach, even with her hands full and phone in her purse. She notes it detects her from about a meter (3 ft) away.
reviewer_claimpositivet=00:36–00:46
The reviewer states that the auto-lock feature is "amazing" and that she never has to worry about locking her house as it locks automatically a few seconds after leaving.
hands_on_demopositivet=01:40–01:49
The reviewer demonstrates using voice commands with Alexa to lock the front door, stating "Alexa, lock front door" and receiving an audible confirmation of the lock's status.
hands_on_demopositivet=01:50–02:04
The reviewer demonstrates unlocking the front door using Alexa voice command, which requires a voice code for added security, and shows the lock successfully unlocking after providing the code.
visual_inspectionpositivet=02:07–02:26
The reviewer describes and visually indicates the U100 lock features a USB-C charging port for emergency power-up with a power bank or phone, in case the battery runs out.
reviewer_claimpositivet=02:27–02:59
The reviewer explains that the lock allows for endless user codes, citing her housekeeper's code as an example, and notes the app logs entries/exits for security and time management.
hands_on_demopositivet=03:00–03:19
The reviewer states the U100 is IP65 weatherproof and demonstrates its resistance by splashing it directly with a hose, simulating rain, to show it withstands outdoor environments.
visual_inspectionneutralt=03:20–04:39
The reviewer unboxes the Aqara Smart Lock U100, commenting on the thoughtful packaging design, and displays all included components, emphasizing that everything needed for various door configurations is provided.
reviewer_claimpositivet=05:07–05:18
The reviewer states that the Aqara Smart Lock U100 can replace any standard deadbolt lock in the USA, as most are drilled with the same proportions, ensuring compatibility.
hands_on_demopositivet=07:35–08:08
The reviewer walks through setting up the UWB ultra-wideband feature using the Apple Home app, scanning the Matter QR code, and adding an Apple Home key, stating it connected in seconds.
hands_on_demopositivet=08:09–08:52
The reviewer demonstrates downloading the Aqara app, registering, searching for the device, and completing the door lock calibration process, showing the home page and firmware update prompt.
hands_on_demopositivet=08:53–09:31
The reviewer shows the process of setting up fingerprint access for user management, demonstrating adding both an index finger and a thumbprint following the app's directions.
hands_on_demopositivet=09:47–10:01
The reviewer demonstrates the manual key override feature by pulling down the front panel to reveal the keyhole and using a physical key to operate the lock.
hands_on_demopositivet=10:02–10:43
The reviewer shows the option to lock and unlock the door from the app's home page and highlights the logging feature that tracks all door events, providing a record of who comes and goes.
The reviewer demonstrates that the Aqara Smart Lock (referred to as U100) automatically unlocks when you approach with your phone, even when it's in your purse or your hands are full. It detects your presence from about 3 feet away, providing a convenient entry without needing to interact with the lock.
The review demonstrates that the Aqara Smart Lock (referred to as U100) can be locked and unlocked using Alexa voice commands, thanks to its Matter over Thread support. For unlocking, an added security feature requires a voice code to prevent unauthorized access.
The reviewer confirms the Aqara Smart Lock (referred to as U100) is IP65 weatherproof and visually demonstrates its resistance by splashing it with a hose. This indicates it is engineered to withstand various outdoor weather conditions like dust and rain.
The reviewer provides a detailed installation guide, demonstrating that the Aqara Smart Lock (referred to as U100) fits standard USA deadbolt holes. The kit includes all necessary components for various door configurations, and the provided installation diagram and user manual are described as very clear and easy to follow.
The review highlights an emergency charging feature for the Aqara Smart Lock (referred to as U100). It has a USB-C port that allows users to temporarily power the lock using an external power bank or a smartphone with a USB-C power supply, in case they forget to recharge the main battery.
The reviewer demonstrates setting up fingerprint access for multiple users and mentions the ability to create endless codes for different people. The companion app also includes a logging feature that records every instance of the door being locked or unlocked, allowing users to track who enters and exits the home.
60/100 source quality
Rebecca Brand reviews the Aqara Smart Lock U400, though she frequently refers to it as the U100. She highlights its UWB hands-free unlocking, auto-lock feature, and voice control via Alexa, showcasing its convenience. The video also demonstrates the lock's IP65 weather resistance, ease of installation as a standard deadbolt replacement, and various user management features like fingerprint and custom codes. The reviewer appreciates the thoughtful packaging, comprehensive installation diagram, and the useful companion app with a logging feature.
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This page converts Rebecca Brand's review of the Aqara Aqara U400 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.
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