The 2-power magnification of the TRUGLO 2x42mm Red Dot Sight makes it truly unique. Waterproof and fogproof for all-weather use. Shock-resistant up to .50 caliber muzzleloader. An 11-position rheostat controls the brightness. The unlimited eye relief, wide field of view, and 2.5-MOA red dot make for fast target acquisition. The TRUGLO 2x42mm Red Dot Sight features multicoated lenses for more than 95% light transmission for brighter images. Flip-up lens caps included. Integrated Weaver-style mounting system. Limited lifetime warranty.Manufacturer model #: TG8030B2. 2-power magnification 11-position rheostat brightness control Multicoated lenses 95% light transmission 2.5-MOA red dot Waterproof and fogproof Shock-resistant Unlimited eye relief Wide field of view Flip-up lens caps Weaver-style mounting