Trackstrap plus with a 2,000mAh battery is made for HTC VIVE trackers 1-3.0. Spend more than 20 hours in VR full body tracking mode.
Rebuff Reality Trackstrap Plus Bundle for Vive Trackers
VIVE Reveals Its First Self-Tracking VR Tracker - VRScout
Trackstrap Wrist Strap For Vr Htc Vive Tracker - Precision Full Body Tracking For Vr And Motion Capture - AliExpress
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HTC makes VR breakthrough with full-body tracking for headsets - Dexerto
Sony's Mocopi Is A Quest-Compatible VRChat Body Tracking Kit For Japan
Bundle Tracker Track Belt & 4 Track Traps Full Body Tracking Combine 5 VIVE VR
Skywin VR Tracker Belt and Tracker Strap Bundle for HTC Vive System Tracker Pucks - Adjustable Belt and Hand Straps for Waist
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The VIVE Ultimate Tracker, Precision In Every Move!
Wait for new HTC Trackers? : r/ValveIndex
HTC's new Vive accessories track VR limbs and other objects without the need for base stations - The Verge