This durable, high quality sight is engineered to give you the advantage of a red dot sight in a compact light-weight, weatherproof and shockproof design, whether you use it for rapid fire shooing of moving targets, or normal shooting.The multi-reticle (4 patterned) optical glass lens is parallax corrected, and produces a clear, high resolution image. Red and Green Illumination are available 4 Different Reticle Patterns Material: Metal Power: 1 x 3V CR2032 battery OBJ. APERTURE: 33mm Total Size: See the picture FIELD OF VIEW 15.8m@100m LENGTH: 81mm WEIGHT: 138g Powered by 1 x 3V CR2032 battery (Included) Red and Green Illumination are available; 4 patterned optical glass lens; Adjustable dot brightness OBJ. APERTURE: 33mm; FIELD OF VIEW 15.8m@100m Powered by 1 x 3V CR2032 battery (Included) The item is shipped from the US. Material: Metal; Fit Picatinny Rail; , CLASS - III A Laser, Power - Less Than 5mW