The SCM-CC Color-Caster is a multi-color, 10 inch underwater LED light that can easily be switched between four color choices (Blue, White, Green and Red). Simply toggle the power off and then back on again to choose a new color. The SCM-CC also has built in fade, flash and strobe modes. No External controller required. Colors can be synchronized with above water lights with the addition of SCM-PD-Plus.