Quoting Meta Open Source:

Project Harrier, from the outset, was designed to begin a revolution around always-on, human-centric computing.

We have upgraded the sensor suite with additional computer vision cameras for announced Loc and body tracking. We have increased battery capacity by over 40% without a weight increase. The device features a contact microphone and spatial microphones; it can distinguish between Bystanders determine your location, both indoors and outdoors. Advanced tracking cameras track your gaze to understand what you’re looking at and track your intent to identify the object you’re interacting with while monitoring your heart rate for a comprehensive understanding of your wellbeing. We introduce the ability to process a lot of the signals on the device in real time. As soon as you do, you move away from the context of data collection and processing later.