Shows which LED colors could light up in parallel. The higher voltage group: white(3.2v) and blue(3.3v) can light at the same time. Likewise, the lower voltage group: red(1.9v), green(2.1v) and yellow(2v) can light too. But mixing the colors of the two groups does not work due to the difference in the voltages unless you use resistors. This simple guide was really helpful to explain to visitors what works and what doesn't.