-“We need to test two leds connected back to back, but also make sure color coded cables are soldered correctly”
Simplicity is the key to success. “rosa” is PINK, “nara-nja” is ORANGE, as to correspond to the color coded cables. Smiley face adds flavour.
The switch just changes polarity.
This is a recent addon, to make it’s connection easier. It will only work with one of our power supplies, but that’s not a problem.