Tracker Dongle Management: Easily connect up to 4 VIVE Tracker dongles (sold separately) Full-body Tracking: quickly and easily get your avatar dancing the night away Optimal Positioning: Upright dongle position insures no Tracker interference, meaning you don't need to waste time getting the perfect setup All Trackers Compatible: Works great will all VIVE Tracker versions including original, 2018, and Tracker 3 USB 3.0: Ensures fast data-transfer speeds even with multiple Trackers running through same PC computer USB port