This product is an outdoor science toy and STEAM product. Specifically: Science (S): It provides a preliminary understanding of the basic external features of concave and convex lenses and their effects on light; Technology (T): Objects can be observed by adjusting the focal length; Engineering (E): An observatory and telescope stand can be built; Art (A): It helps understand the origins of telescopes, drawing telescopes, and observing scenes through telescopes; Mathematics (M): Objects can be observed and distances judged. The product also highly considers children by providing different usage methods for children who do and do not wear glasses. Through exploration and operation, children gain a preliminary understanding of the imaging principles of convex and concave lenses and light convergence and divergence effects. This further promotes children’s interest in exploring magnifying glasses, microscopes, funhouse mirrors and the wonderful changes in the world.