the Refractor Has a Strong Focal Length,A Large Field of View,And a Strong Resolution.20m Aperture,2030Mm (F/10) Focal Length,Ma40Mm Eyepieces,843X Light-Gathering Power,Large Field of View,Full-Surface Coating,Starbright Xlt Optical Coating,High Light Transmittance,Enhanced Image Brightness and Clarity. It is Very Suitable for Astrometric Work,And It Performs Well in Observing the Moon,Planets,And Binary Stars. Easy to Observe the Ground View,Very Suitable for Enlarged Photography of the Moon and Planets the Telescope is Suitable for Beginners or Children. It is Easy to Install and Observe for Beginners. It Will Encourage Children to Like Learning Space,Get Close to Nature and Stay Away from Electronic Products. and Provide a Wonderful Holiday or Birthday Gift Idea for Children Who Like Science and Astronomy. the Telescope Provides Our Customers with a 24- Warranty. If You Have Any Questions About Quality after Receiving This Space Telescope,Please Contact Us for the First Time. We Provide a High Standard of 24/7 Customer Service,And Will Do Our to Solve It for You Until You Are Satisfied.