SeeAll Tritium-Lit Gen 2 Open Sight | Ultra Fast Target Acquisition | Picatinny Rail Mount Compatible for Rifle or Shotgun | No Battery Needed (Crosshair Reticle) NIGHT VISIBLE - Don't rely on old-school iron sights that haven't changed in hundreds of years. The Tritium-Lit Gen 2 replaces them with night visible modern technology and NO BATTERY REQUIRED! IMMEDIATELY IMPROVE YOUR SHOOTING! See All Technology will help you gain much faster and accurate target acquisition. Zero parallax error means "What you see is what you shoot!" MORE ACCURATE & RELIABLE THAN YOUR TYPICAL RED DOT SIGHT - No batteries are needed with our built-in "Edge-Glow" polycarbonate technology providing a vast improvement in low light conditions. Tritium Inlay allows for reticle visibility in even the darkest of nights! PREMIUM QUALITY! MADE IN THE USA, our Open Sights are built for abuse! Tested at up to 200 degrees and rugged enough to withstand the weight of a truck, our sight will always maintain its zero...ALWAYS! IMPROVED MODEL & FULLY COMPATIBLE - The Gen 2 comes with a new sleeker design. Quickly mounted on picatinny or weaver rails with the built-in Quick Detach (QD) knob. Also comes with easy-to-use dependable adjustments that won't budge. Zero in once and never worry again!