The Vive XR Elite receives an add-on that incorporates face-tracking technology, including the detection of eye and mouth movements. - Road to VR
Vive XR Elite Gets Face-tracking Add-on with Eye & Mouth Sensing
HTC has announced the release of a new Full Face Tracker accessory for the Vive XR Elite. Priced at $200, the device attaches magnetically to the XR Elite headset and captures eye and mouth movements. The tracker can be used by developers for various purposes, such as animating avatar faces more realistically and improving the VR experience. It also includes automatic IPD adjustment. The Full Face Tracker is designed with OpenXR in mind, making it compatible with applications that have previously implemented OpenXR-based face-tracking. Visit the source for the full story.
Source: https://www.roadtovr.com/htc-vive-xr-elite-full-face-tracker-accessory-eye-mouth-tracking/