The Barska 7-21x40 Colorado Zoom Binocular utilizes the unique porro prism setup to create a compact design for larger 40mm objective lenses. The powerful 7-21x zoom allows the user to either view a wide landscape scene or zoom in on a specific object for more detail. Large objective lenses and fully coated optics work together to maximize light transmission and deliver astounding clarity, even in low light conditions. A durable rubber finish provides protection from impact and also serves as a comfortable gripping surface.• 7-21x Zoom Magnification• 40mm Large Objective Lens• Fold-Down Eyecups• Center Focus Knob• Reverse Porro PrismSpecificationsModel Number: CO10686Focus System: CenterPrism Type: Reverse PorroPrism Glass: BK-7Magnification: 7x - 21xClose Focus: 10'Eye Relief: 14 mmObjective Lens: 40 mmExit Pupil: 5.5 mmField of View @ 1000 yds.: 90'Diopter: Right EyeOptical Coating: Fully CoatedWaterproof: NoFogproof: NoWeight: 27.2 oz. Dimensions: 5.5" x 5.9" x 2.88"Finish: Matte BlackIncluded Accessories: Carrying Case, Neck Strap, Lens Covers, and Lens ClothMfr. Warranty: Limited Lifetime Fully coated optics maximize light transmission for astounding clarity Durable rubber finish provides protection from impact Fold-down eyecups & center focus knob | Barska 7-21x40mm Colorado Binocular