The Pro Flash 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. The diagonal kicker fin on the back gives this flasher a lot more action particularly at slow speeds than a conventional 11 inch flasher. The electronic EChip adds another big fish catching advantage.