# The Aqara UWB Smart Lock U400: A New Benchmark in Smart Lock Innovation
Smart locks have transformed home security by removing the reliance on conventional keys. Nonetheless, many still lack convenience, particularly during instances when your hands are occupied. The advent of Ultra-Wideband (UWB) technology aims to resolve these problems, with the Aqara UWB Smart Lock U400 leading this advancement.
## What is UWB, and Why Is it Important?
Ultra-Wideband (UWB) technology is a short-distance wireless communication standard that delivers accurate location tracking. It is the same technology utilized by Apple for Precision Finding in AirTags. The Aqara U400 harnesses UWB to ascertain not only your closeness to the lock but also your precise direction, improving the auto-unlock feature that numerous smart locks currently offer. Unlike traditional Bluetooth or Wi-Fi, UWB ensures a more dependable and seamless experience, positioning itself as a likely standard for future smart locks.
## Matter over Thread with Aqara U400
The Aqara U400 operates on the Matter over Thread protocol, significantly boosting its functionality. Thread is quicker than Bluetooth and does not congest your Wi-Fi network, enabling rapid responses in the Home app. This capability is especially advantageous for households with diverse ecosystems, allowing Android users to manage the lock via Google Home or Amazon Alexa, while Apple users benefit from complete integration with HomeKit.
### Key Attributes
– **Home Key**: Users can tap their iPhone or Apple Watch to unlock the door, offering an alternative to auto-unlock.
– **Fingerprint Scanner**: A biometric scanner is embedded in the keypad for enhanced security.
– **Passcode**: A concealed touchscreen keypad illuminates for guests, with passcodes overseen through the Home app.
– **Physical Key**: The lock features a rekeyable keyway, compatible with existing house keys.
## Power
The Aqara U400 uses a rechargeable lithium battery, rated for about six months per charge. While some users may prefer standard AA batteries for easy replacement, the addition of a USB-C port allows for convenient charging without the need to detach the lock from the door. This feature is particularly handy for those who might have a portable power bank available.
## Conclusion on Aqara U400
The Aqara U400, alongside the Level Lock Pro, signifies the apex of smart lock technology currently on the market. With its integration of Ultra-Wideband (UWB), Matter over Thread, and user-centric features like PIN code management in the Home app, it establishes itself as a top choice for smart home aficionados. The synergy of these technologies makes administering a smart lock through Apple Home more effective than ever.
For those looking to enhance their home security, the Aqara U400 is available for purchase on [Amazon](https://amzn.to/4tbtPzC).