The PF4-780 Flasher is a four inch flasher.  It is a white blade with half Pink Crush and half Purple Scale tape on top, and features a built-in water activated light which turns on when it contacts the water, and turns off when dry.  It’s unique circuits flash red, white and green on both sides of the flasher.  The sealed battery lasts 80 hours or more and then the light can be easily replaced.