Aqara U400 Smart Lock: Matter Over Thread, Apple Home Key, Fingerprint & Touchscreen Keypad | HomeKit, Alexa, Google

Elevate your home access with Aqara U400

Meet the Aqara U400 Smart Lock, finished in a sleek silver tone that blends with modern doors. Designed for everyday life, it combines advanced access technology with practical durability, offering a more streamlined way to secure your entry without sacrificing security or control.

True Hands-Free Unlocking with UWB — The UWB system detects your approach, direction, and intent to unlock as you come near. This can feel effortless when your hands are full, you’re wearing gloves, or you’re arriving in the rain. A note: UWB unlocking requires a Thread-enabled Apple Home hub and is supported on Apple Watch Series 6+ (watchOS 11.5+) and iPhone 11+ (iOS 18.5+).

All-in-One Unlocking Options provide flexibility for how you enter your home. From a tap at the Apple Home Key to biometric and PIN entry, as well as remote control and a physical key, you can choose the method that fits your moment.

• Apple Home Key tap-to-unlock (requires a Thread-enabled Matter controller such as HomePod 2nd Gen, HomePod mini, or Apple TV 4K 2021/2022).
• Fingerprint authentication for quick, secure access.
• Touchscreen passcode for convenient keypad entry.
• Voice assistant control from your preferred ecosystem.
• App remote access to manage doors from anywhere.
• NFC card support (sold separately) for embossed or digital cards.
• Physical key as a trusted fallback option.

Matter Over Thread for Multi-Ecosystem Compatibility lets the U400 connect across platforms, delivering faster response, stable connectivity, and secure data transmission. For each ecosystem, a Thread-enabled Matter controller is required to access its features.

• Seamless integration with Apple HomeKit, Amazon Alexa, Google Assistant, and Home Assistant.
• Shared benefits across ecosystems, plus platform-specific automations and video integrations.

Power, Durability, and Security

The U400 runs on a rechargeable, removable lithium battery designed for long life—up to about six months per charge under typical use. When you need a top-up, use the USB-C port to recharge without taking the lock offline, or remove the battery for a separate charge. A low-battery alert helps prevent surprises.

• Rechargeable and removable battery for easy maintenance.
• USB-C recharging keeps your door accessible during power-ups.
• Low-battery voice alert at 20% to help you plan a recharge.
• BHMA-certified for mechanical strength and long-term reliability.
• IP65-rated exterior guards against dust and water, suitable for outdoor use.
• Rekeyable cylinder lets you change the physical key without replacing the lock.

Smart App Experience and Home Integration

With the Aqara app, tailor access to your family and guests. Auto Lock, Night Latch Mode (admins and physical keys only), and Do Not Disturb Mode help you choose when and how doors can be unlocked. The lock pairs with Aqara cameras like the G5 Pro and G410 doorbell, enabling you to view visitors and unlock directly via live video interaction.

In short, the Aqara U400 blends modern access methods, cross‑ecosystem compatibility, and practical durability into a single smart lock that can adapt to your routines while remaining secure and controllable from your preferred platform.