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The NX75 mod shows “B” on the screen, and the wattage or voltage cannot be adjusted, why?

Letter “B” means bypass, which means that the mod is under bypass mode, the voltage and wattage cannot adjusted, the mod will automatically adjust the output wattage or voltage according to different resistances of the coil attached.

If you want to change the wattage, you need go to the wattage mode, press W button to switch mode between VW, VV and Bypass modes.