У вашего броузера проблема в совместимости с HTML5
Checkout the Weldmonger store http://goo.gl/fAFO3v
for a more detailed article on this topic go here http://www.weldingtipsandtricks.com/tig-torch-switch.html
I would rather use a foot pedal for most tig welding but sometimes a torch switch comes in really handy. that is why you need to know what 2t and 4t settings do and how to use upslope and downslope.