I have talked about Scythe a few times; the company makes all manner of peripherals and cooling products for computers. The latest peripheral form the company is the USB Foot Switch.
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These things are far from new products, I had something similar for gaming long ago. They are foot switches that you can plug in via USB and bind commands and controls for games and other applications to the pedals.
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The switch can be had in a single, double, or triple version. The pedals are compatible with Windows only and price and availability are unknown.