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FreeTrack kit / set powered from USB port, with infrared LEDs Osram SFH485P for head movement tracking devices (Free Track) as per the designs (and LED type recommendation) provided on the website: http://www.free-track.net/english/. These devices can be used in conjunction with a standard WebCam, for example, to enable a disabled person to control a computer, or to simply improve the use of flight simulation software, especially the excellent IL-2 series, giving a highly-realistic sensation of flying. Included are: 3 x IR LEDs Osram SFH485P; 1 x resistor 6.8...10 Ohm, 1/4 W; 100 cm isolated wires (red and blue); 1 x USB cable, 2.5 m length, for connection to computer.