Aqara · Reviewed by Jon Rettinger · Published 2026-04-07
Based on a review by Jon Rettinger (accessed 2026-04-07).
Based on this review alone: buy it if you care about ultra-wideband (uwb) for accurate, reliable proximity unlocking — just accept requires six-digit codes on keypad (cannot use shorter ones).
The reviewer concludes that the new Aqara products, especially the U400 lock and W200 thermostat, deliver on the promise of a smart home that "just works" by getting out of the way and requiring minimal thought or interaction. He found the U400 lock to be a significant quality-of-life improvement and plans to buy more.
Jon Rettinger reviews a collection of Aqara smart home devices, including the U400 smart lock, G410 doorbell, and W200 thermostat. The review focuses on how these products integrate to create a seamless smart home experience, evaluating their performance and practical benefits.
The Aqara U400 is highly recommended for its seamless and reliable hands-free unlocking, outperforming other smart locks on the market. Its ultra-wideband technology accurately detects approach angles and user location, preventing accidental unlocks from inside the house. The lock also features an incredibly fast locking mechanism and a much more accurate fingerprint reader compared to older models like the U100. If you prioritize convenience and security in a smart lock, this product is an excellent choice. If you are looking for a lock with simple, short keypad codes, this lock requires six-digit entries.
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hands_on_demopositivet=00:23–00:52
The reviewer describes a real-life scenario where his garage door, equipped with an Aqara smart lock, automatically unlocked when he approached, even with his hands full. He calls it a "big quality of life improvement."
reviewer_claimneutralt=01:43–02:08
The reviewer states he has been spending his own money on Aqara products for two years, purchasing U100 locks, a G400 doorbell, G2H Pro cameras, and a G3 camera hub, none of which were sent to him initially.
comparisonpositivet=02:37–02:59
The reviewer upgraded his doorbell from the G400 to the G410, noting immediate improvements such as better resolution, a wider field of view to see the whole porch, and a millimeter wave presence sensor. He states the G410 was sent by Aqara.
hands_on_demonegativet=03:41–03:55
The reviewer demonstrates the U100 lock's fingerprint reader, which required three attempts to successfully unlock, indicating inconsistency.
hands_on_demopositivet=04:54–05:14
The reviewer demonstrates the U400 lock, noting its "insanely fast" locking speed, stating he has "never seen a lock do this."
hands_on_demopositivet=05:15–05:46
The reviewer performs a hands-on demonstration of the U400 lock's ultra-wideband feature, showing it automatically unlocks when he approaches with his hands full, describing it as "pretty flawless for the most part."
comparisonpositivet=06:06–06:20
The reviewer directly compares the U400's fingerprint reader to the U100's, stating the U400 is "way more accurate" and demonstrating its quick and reliable operation.
reviewer_claimpositivet=06:33–06:57
The reviewer explains that the U400's ultra-wideband (UWB) technology intelligently distinguishes which side of the door he is on, preventing accidental unlocks when approaching from the inside, unlike previous Bluetooth locks he used.
specification_claimpositivet=07:18–07:39
The reviewer highlights that the W200 thermostat integrates an Aqara hub, providing cross-platform compatibility with Matter, HomeKit, Google, and Alexa.
hands_on_demopositivet=07:54–08:24
The reviewer explains that the W200 thermostat displays a screenshot from the G410 doorbell, allowing identification of visitors from the wall unit without physically going to the door, which is useful for safety with kids.
reviewer_claimpositivet=08:34–09:20
The reviewer explains that the W200 thermostat uses Apple's adaptive control, leveraging location data from iPhones and Apple Watches to adjust temperature based on actual occupancy. He notes its subtle effectiveness, stating he hasn't "fought with it once," unlike every other thermostat he's used.
reviewer_claimpositivet=09:36–09:47
The reviewer expresses his satisfaction with the U400 lock by stating he is buying two more units to replace his current front door locks.
reviewer_claimpositivet=09:47–10:00
The reviewer notes his surprise at how much he uses the W200 thermostat, despite initially having low expectations, emphasizing its functionality beyond just temperature control.
reviewer_claimpositivet=10:00–10:09
The reviewer credits the G410 doorbell with integrating the three Aqara products into a cohesive smart home system.
The reviewer praises the U400 lock for its ultra-wideband (UWB) auto-unlock, demonstrating it working flawlessly even with his hands full. He notes it intelligently knows which side of the door he's on, preventing unintended unlocks from inside, a common issue with older Bluetooth locks. The lock mechanism itself is also noted for its insane speed.
The reviewer replaced his older G400 doorbell with the new G410 and immediately noticed improvements. These include better resolution, a wider field of view that captures the entire porch, and the addition of a millimeter wave presence sensor for enhanced detection.
The reviewer highlights that the W200 thermostat functions as an integrated Aqara hub, making it compatible with a wide range of smart home ecosystems, including Matter, HomeKit, Google, and Alexa. This ensures broad cross-platform support for users.
The reviewer explains that the W200 thermostat uses Apple's adaptive control, which pulls live location data from Apple devices in the home. This allows it to adjust heating and cooling based on who is home, away, or asleep, providing subtle and effective temperature management without relying on a fixed schedule.
The reviewer emphasizes that the Aqara products, especially the new G410 doorbell, help tie the system together, making the U400 lock and W200 thermostat feel like a single cohesive unit. He states that after two years with Aqara, his home "just works" and he no longer has to think about individual devices or apps.
The reviewer highlights the U400's integrated fingerprint reader as being significantly more accurate and quicker than the one on the older U100 model. He demonstrates its flawless operation, contrasting it with the U100 which required multiple attempts.
The reviewer mentions that the W200 thermostat integrates with the G410 doorbell to display a screenshot of who is at the door. This feature is particularly useful for safety, allowing both adults and children to identify visitors without physically approaching or opening the door.
75/100 source quality
In this video, Jon Rettinger shares his experience using Aqara smart home devices, highlighting how they've transformed his home into a truly functional "smart home that just works." He praises the new U400 lock for its ultra-wideband auto-unlock feature, the G410 doorbell for its improved resolution and presence sensor, and the W200 thermostat for its integrated Matter hub and adaptive control. The reviewer emphasizes the subtle, effortless operation of the system over flashy automations, making daily life easier.
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This page converts Jon Rettinger's review of the Aqara Aqara U400 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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