Uploaded January 2026 | Updated September 2026, 8 hours ago

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The Aqara U400 smart lock is a long-awaited Ultra Wideband (UWB) door lock that lets you walk up and unlock with your iPhone or Apple Watch using Apple Home / HomeKey, plus support for Matter and broader ecosystems. In this review, I cover real-world UWB performance, setup in Apple Home vs the Aqara app, battery life with USB-C emergency power, and key features like fingerprint unlock, keypad PINs, auto-lock, and a new option shown at CES.

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Aqara U400 on Amazon geni.us/jq2vMhA
Aqara U400 with metal at Apple apple.com/shop/product/hs3y2zm/a/aqara-smart-lock-u400-lock

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*Chapters*
00:00 Introduction
00:27 What is Ultra Wideband?
01:07 Hardware and installation
03:02 Smart Home Setup
04:37 What is Aliro UWB?
05:28 What about Apple's second-generation UWB chip?
06:02 A surprising limitation
06:57 Auto locking
07:50 Other ways to unlock
08:34 Controlling away from home
09:14 Details I saw at CES
10:15 Is this lock right for you?

#aqara #smartlock #applehome

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