Aqara introduced the U400, a HomeKit‑compatible lock that replaces a deadbolt instead of merely covering it. Installation takes about an hour, with a delicate wiring step but delivers a more integrated experience.

The U400’s standout feature is Ultra‑Wideband support, the first HomeKit lock to leverage iOS 18’s UWB. The lock unlocks automatically as the user approaches, eliminating the lag typical of Bluetooth‑based systems.

Beyond UWB, the lock offers NFC tap‑to‑unlock via Express Mode, a touchpad passcode, and optional fingerprint use. A rechargeable USB‑C battery promises up to six months of use, replacing bulky CR123A cells.

Priced at $269.99, the U400 delivers a frictionless entry experience that few competitors match today. For consumers seeking seamless HomeKit integration, it represents a tangible step toward the promised “just works” smart‑home future.