What sets Trijicon® TriPower sights apart from all other gun sights is that Trijicon TriPower sights are powered by three separate light sources. First, the TriPower sight uses an integrated fiber optic system to automatically adjust brightness and contrast to increase visibility. Second, a tritium powered phosphor lamp works to illuminate the reticle to provide a distinct aiming point at all times of day and night. Lastly, an on-call battery backup system is put in place to ensure that you receive a clear image no matter what the situation. With the combination of these three light sources, the Trijicon TriPower is the first triple-illuminated sight to hit the firearm market. When you want to make your shot count and receive the ultimate in optical clarity, be sure to check out our selection of Trijicon TriPower sights.