The 3.9' (1.2m) Futaba Radio Head Tracker Data Cable for Select FPV Headsets from Fat Shark plugs into the PS/2 data port on your DominatorHD, DominatorV2, or Attitude V2 FPV headset, and passes head tracking control data from the Trinity 3-Axis Head Tracker Module to a Futaba radio. It also can supply power to your headset from the radio. If multiple power sources are supplied at the same time, the headset will draw power from the highest voltage.