What does the ø mean in the IR loader?

It’s right below the on/off power button. Is it a phase switch? I don’t notice anything happening when I toggle this on/off.

I think it’s the phase switch (180-degree phase reverse). It should be noticeable if you’re using a second IR, but likely not if you’re only using one. Hope this helps.

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That is correct, it’s the phase switch as @DiffractionCircuit indicated.