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Battery-powered FreeTrack kit / set 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; 3 x 30 Ohm resistors, 1/4 W; 1 x battery-holder for 2 x AA with on / off switch; 100 cm isolated wires (red and blue); batteries and tape are not included.