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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.

2021-10-14 04:32:10 Helpful (0)
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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

2021-08-26 06:29:26 Helpful (1)
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