HTC Announces Face-tracker for Vive Pro and Vive Tracker 3.0
HTC VIVE 3.0 Trackers - FULL BODY VRCHAT - WITH TrackStrap plus battery straps | eBay
HTC 3 Pack Vive Tracker (3.0)
What's inside the box?
FULL BODY TRACKING - VIVE Trackers 3.0 - YouTube
Vive Facial Tracker Can Work with Index and Other PC Headsets
Amazon.com: HTC 3 Pack Vive Tracker (3.0) Vive SteamVR Base Station 2.0 for Vive Pro, Rebuff TrackBelt + 2 TrackStraps Full Body Tracking VR Bundle : Video Games