Aqara U400 review: HomeKit’s futuristic smart lock has arrived

The Aqara U400 smart lock represents a significant advancement in enterprise physical security infrastructure by being the first to implement Ultra Wideband (UWB) technology with Apple HomeKit, enabling seamless, proximity-based access control without user authentication steps. This technology demonstrates the maturation of smart building solutions from consumer convenience features to enterprise-grade security systems that can integrate with existing identity and access management frameworks. The device's multiple authentication methods (UWB, NFC, biometric, passcode, physical key) and HomeKit integration suggest a future where physical access control can be unified with digital identity systems, potentially reducing IT overhead for managing building access credentials.