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most likely, given that there are never any drivers installed and i can use a usb wall charger, the clip is drawing +5 volts off the usb power rail.

don't really think it matters as long as its an infrared led and the tracking points are about the correct distances from one another.

usp has to be the most expensive carrier. their cheapest rate (~$20) is two times the price of the replacement track ir clip (~$10). side note: i have been keeping that cheap flimsy ball cap reflector in its original box for months. i left it out and assembled and within 20 minutes my wife found it ...