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"When other sights become useless, TRU-DOT really shines. It doesn't require switches to turn on or batteries to wear out, as both its front and rear blades have their own green tritium gas light source that provides a green/green, 3-dot sight picture. Some of its models are also available in green/yellow and green/orange. The front sight is always green for contrast with the rear sight. TRU-DOT remains unaffected by weather, gun solvents or oils, and is extensively used by NATO, US, and Israeli armies. It is also perfect for law enforcement and anyone requiring accuracy in low-light conditions. Each package contains both front and rear sights. Rear sights either replace the original rear entirely or, on S&W revolvers, a new rear leaf, screw, and nut are provided. Front sights either replace the original (1911 Auto), slip over and pin to the original blade (most other autos), or replace the factory-colored insert (S&W Autos). TRU-DOT sights have a factory warranty for 12 years for the original purchaser."