Aqara's U400 smart lock is the first and only model to feature Ultra Wideband Home Key support, a significant leap in smart home security. After a month of testing, this lock delivers seamless integration with Apple's ecosystem, auto-locking reliably without user intervention. While its design is functional rather than striking, the U400 excels in Apple Home integration and battery efficiency, using Thread protocol for low-power, secure communication.

Its BHMA Grade 3 certification, while lower than some competitors, still provides robust residential security. The standout feature is its native Apple Home support, allowing effortless unlocking via iPhone or Apple Watch without codes or apps, making it a compelling choice for Apple-centric homes.