Most smart locks still rely on PIN codes or phone taps, but Aqara’s new U400 unlocks the future of access. The $269.99 lock, available via Aqara’s U.S. store, incorporates Ultra‑Wideband (UWB) positioning to sense when an authorised user is approaching and unlock automatically without touching a thing. If you prefer Apple’s ecosystem, the U400 supports Home Key in the Wallet app, letting you unlock by simply holding an iPhone or Apple Watch near the reader. Multiple unlocking methods are still available, including PIN entry, NFC tags and a fingerprint sensor.

The lock’s rechargeable lithium battery pack keeps maintenance simple and, unlike disposable battery locks, can be topped up via USB‑C. Aqara also equipped the U400 with Matter over Thread certification so it plays nicely with Google Home, Amazon Alexa and Samsung SmartThings. A built‑in gyroscope automatically triggers the deadbolt when the door closes, and the IP65 weather‑proof rating means it’s designed to survive driving rain and dust storms. Aqara notes that the lock has earned BHMA certification for durability and security, and it pairs seamlessly with the Doorbell Camera Hub G410 for remote viewing and unlocking.

For homeowners who don’t want to fumble with keys, the U400 offers the first mainstream UWB smart lock in the U.S. market. If you’re weighing your options, IMBOLDN previously reviewed the August Wi‑Fi Smart Lock and maintains a running list of smart home upgrades.

Aqara’s approach stands out by combining hands‑free unlocking with future‑proof connectivity, making it a compelling upgrade for any front door.