# Keys are Obsolete - Aqara Smart Lock U400 Source: https://www.youtube.com/watch?v=oIs2ZCcj2Vg Recap page: https://rapidrecap.app/video/oIs2ZCcj2Vg Generated: 2026-01-28T22:04:55.484+00:00 --- ## Quick Overview The Aqara Smart Lock U400 successfully demonstrates hands-free unlocking using Ultra-wideband (UWB) technology with an iPhone, instantly unlocking as the user approaches the door, effectively making keys obsolete for primary access. **Key Points:** - The Aqara Smart Lock U400 supports hands-free unlocking on approach using UWB technology, with demonstrated accuracy down to 100 cm. - The presenter successfully installs the lock, noting that unlike previous models, this installation does not require drilling new holes in the door frame for the latch strike plate. - The lock supports multiple access methods including UWB approach unlock, Apple Wallet, up to 50 fingerprints (with 0.3-second recognition speed), and a capacitive keypad. - The UWB feature is currently available for iPhones, but Aqara claims future support via the Matter/Aliro Standard is planned for Android phones. - The presenter highlights that the lock's removable, rechargeable battery allows for charging while still installed via a USB-C port on the exterior plate. - The lock integrates with smart home ecosystems like Apple Home, Samsung SmartThings, Home Assistant, and Google Home via Matter over Thread. - The price point mentioned for the lock is $269.99 USD. ![Screenshot at 00:08: The sponsor message appears over a product shot, highlighting the Aqara Smart Lock U400 as the "World's first smart lock with UWB unlock on approach," setting the central theme of the review.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-00-08.jpg) **Context:** The video is a sponsored hands-on review and installation guide for the Aqara Smart Lock U400, focusing on its cutting-edge UWB 'unlock on approach' feature, which aims to replace traditional keys. The presenter unboxes the lock, details the components, demonstrates the installation process on an existing door, and tests the keyless entry features, including UWB, fingerprint recognition, and smart home integration. ## Detailed Analysis The video showcases the installation and features of the Aqara Smart Lock U400, sponsored by Aqara. The presenter begins by unboxing the lock, noting the inclusion of necessary hardware and a template for setup. He points out that the installation is designed to be straightforward, requiring the removal of the old deadbolt but often not requiring new drilling for the strike plate, unlike some older smart locks. Key components shown include the exterior keypad unit, the interior battery/motor housing, the latch mechanism, and the rechargeable battery pack. The presenter demonstrates installing the latch mechanism and the internal mounting plate, emphasizing the importance of correctly orienting the latch so the bevel faces the door closing direction. After installation, the device is paired via the Aqara Home App using a QR code scan, and fingerprints are enrolled, with the presenter noting a 15-second window for enrollment. The standout feature, UWB unlocking, is tested successfully: as the presenter walks toward the door with his iPhone, the lock automatically unlocks (indicated by a green UWB light), which is noted as being more secure and accurate (within 1 meter) than standard Bluetooth proximity unlocking. The presenter also shows the emergency backup: the removable battery can be charged via USB-C without removing the entire unit from the door, and a hidden physical key override slot is present under a small door on the interior assembly. The lock supports Matter over Thread, allowing integration with various ecosystems like Apple Home, Google Home, and Amazon Alexa devices for voice control routines, such as locking all doors upon leaving. ### Product Introduction - Unboxing the Aqara Smart Lock U400 - Highlighting UWB hands-free unlock feature - Price listed at $269.99 USD ### Installation Overview - Removing the old deadbolt and installing the new latch and mounting plate - Noting that the existing door bore holes often fit the new mounting plate without modification - Installing the interior assembly and connecting the battery wire ### Key Features & Functionality - Demonstrating UWB approach unlock (works best with iPhone currently) - Enrollment of up to 50 fingerprints with 0.3-second recognition - Showing the removable, rechargeable battery with exterior USB-C charging capability ### Smart Home Integration - The lock supports Matter over Thread for compatibility with Apple Home, Google Home, and Alexa devices - Voice control demonstrated via an orange Echo device to lock the door ### Security Comparison - UWB is presented as superior to Bluetooth due to its directional accuracy (1m accuracy) and resistance to relay attacks using STS (Scrambled Timestamp Sequence) ![Screenshot at 00:04: The presenter points to the old keyless entry lock being removed, which will be replaced by the Aqara U400.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-00-04.jpg) ![Screenshot at 00:08: A promotional graphic displays the Aqara Smart Lock U400 and text emphasizing its UWB unlocking feature upon approach.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-00-08.jpg) ![Screenshot at 00:44: The presenter holds up the old deadbolt mechanism and the new strike plate accessory provided with the U400, comparing them.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-00-44.jpg) ![Screenshot at 03:33: The presenter demonstrates how the rechargeable battery pack can be removed and plugged in via USB-C without fully dismounting the lock from the door.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-03-33.jpg) ![Screenshot at 04:45: The UWB indicator light on the exterior panel glows green as the presenter approaches, signaling successful proximity detection just before unlocking.](https://ss.rapidrecap.app/screens/oIs2ZCcj2Vg/00-04-45.jpg)