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charlie they are like any other ir led. some people might be able to see a slight red glow. use your smart phone's camera if you want to see if they are lighting up.

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charlie it is most likely used to adjust the output voltage up or down slightly. do not know for sure since i have not received the one i ordered yet. but i've used similar items in the past that had those types of pots on them

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charlie 110v only 220v will damage the unit, any stick electrode should work 6013 is what i use.

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