Beileshi 15 - 55x Zoom Adjustable 21 mm Compact Pocket Sized Monocular Telescope for Golf, Scope, Camping, Hiking, Fishing, Birdwatching and Concerts Zoom adjustable: 15x to 55x Zoom Objective lens aperture: 21mm Size: 4.25" x 1"; Color: Black and Gray Package Contents: 1 x Monocular, 1 x Case, 1 x Cleaning Cloth Fully multi-coated blue lens to achieve outstanding performance by minimizing light reflection, increasing light transmission and brightness.