Customize your look Your desire to customize your power supply can be satisfied now. The color ring accessory pack, available separately, lets you match your GS Series PSU's accent color to your system's look, and the fan has red, white and blue LEDs (blue only on the GS600) to bathe the inside of your system in soft light. Running in stealth mode? You can turn off the lighting with a hardware switch that's accessible from outside the case.