Logitech 871003 Head Tracker 3D Mouse Ultrasonic Virtual Reality System
As Is - Missing Triangular Receiver The Tracker plugs into your serial port and delivers 3 dimensional, 6 degrees of freedom (x, y, z, pitch, yaw, roll control.) Up to four HeadTrackers can be connected together to act simultaneously in VR or Simulation applications. Ultrasonic technology eliminates metal or display interference. This system is missing the triangle receiver and has not been tested.