The storage case is made of hollow high-quality iron and the outer layer is rust-proof. The material is hard and non-deformable with its own spring contraction and vertical pull-down screen for a straightforward picture. If the imported material is surrounded by white edges it does not seem to have a focused visual center. The black edge absorbs the projected spot and fills the screen with the entire center of vision. A variety of scenarios for a variety of purposes: teaching training workplace watching movies playing games singing