This is the 3x IR LED boom that attaches to a cap or headgear , which is then tracked by the track IR base station.
The perfect TrackIR™ accessory that attaches to your over-the-ear headsets.
Active LEDs for precise tracking USB power tap, with USB pass through Ultra light weight Range 2 to 5 feet (61 cm to 152 cm) 2 position headset clip Attaches to headset bands above left ear Compatible with headset bands up to 1 1/4″ wide and up to 1/2″ thick