https://www.vive.com/us/accessory/vive-wrist-tracker/
VIVE Wrist Tracker - Enhanced Hand Tracking for VR Headsets
Enhance your VR headset's hand tracking or bring real-world objects into virtual reality. Compatible with VIVE Focus Vision, VIVE Focus 3, and VIVE XR Elite.
wrist trackerhand trackingvr headsetsviveenhanced