With the Celestron StarPointer Pro Finderscope you spend less time centering your target and more time stargazing. The traditional red dot finderscopes were originally created for shooting sports, but the StarPointer Pro was designed for astronomers by astronomers to provide the easiest experience locating celestial objects in the night sky. You�ll appreciate StarPointer Pro�s thoughtful design features whether you�re new to the hobby or a seasoned amateur astronomer. While a red dot can obstruct your desired target, StarPointer Pro projects two circular LED reticles. Just place your target inside the circles and it�s ready to view in the eyepiece. The circles also serve as a measuring tool while starhopping. For added convenience, StarPointer Pro offers a 40 mm optical window with a large field of view.StarPointer Pro attaches quickly to any telescope and secures with a dovetail connection and finger knobs. No screwdriver needed.Features- Designed by astronomers for astronomers, this premium finderscope allows you to precisely zero in on your target- Projects a dual-circle reticle, not a red dot that can obscure your subject- Larger 40 mm optical window offers a wider field of view so you can acquire targets quickly and easily- Brighter LED for easy visibility during the day- Easy dovetail connection; no tools requiredSpecificationsLens Diameter: 40mmBattery: 1x CR2032 (included)Mounting Brackets Included:1x Large Schmidt-Cassegrain1x Small Schmidt-Cassegrain1x Small Telescope with dovetail mount1x Small telescope with holes for threaded postsProduct Dimensions: Length: 6", Width: 2", Height: 3.5"Weight: 5 oz