The SpeedDot 135 red dot sight will hold up to brutal punishment, yet deliver a crisp, round, bright red dot consistently. It has 11 dot brightness settings to choose from. The rugged 35mm main tube is nitrogen filled and sealed to be completely waterproof and fogproof. If offers up a huge, fast-target-acquisition field-of-view that’s crisp and clear. If it is fast and positive enough for IPSC speed shooting competition, you can imagine just how fast you will be able to aim at a deer or a turkey. The 3MOA size dot offers precision, fast-action shooting. Burris-Quality Optics features fully coated lenses for a bright, sharp, clear, and non-reflective sight picture. Each SpeedDot includes lens covers, Weaver®-style mounting rings and an easy-to-find #2032 camera battery with a 200+ hour life at the highest setting. Weighs 7.7 oz, with rings and is 4.38 inches long.