The Monstrum R01C Red Dot Sight is a high precision sight designed for faster, more accurate target acquisition. Select between four different reticles, red or green illumination, and multiple brightness settings for the perfect sight picture regardless of lighting or environment. Compact and lightweight in design, yet fashioned from sturdy aircraft grade aluminum, the R01C Red Dot Sight secures seamlessly on top of any Weaver/Picatinny rail equipped firearm. With a flexible eye relief, it is suitable for just about any shooter or rifle. Only 3.2 inches in length, 2.2 inches in height, 1.4 inches in width, and 3 ounces in weight, it can even be mounted on top rail equipped pistols. It comes with a removable lens caps and one 3V CR2032 battery. Four selectable reticle patterns, illumination in red and green, and multiple brightness settings, for a clean sight picture regardless of lighting conditions or environment. Flexible eye relief, suitable for almost any shooter or firearm. Mounts easily to any Weaver/Picatinny rail system. Available in Black or Flat Dark Earth.