ProHT s Manual pull projector screen is an affordable solution for professional or personal projection needs. High-level quality material provides 1.1 Gain. 4K Ultra HD and Active 3D Projection Ready. Features 160-degree viewing angle with fully black backed front projection screen material. The specially designed slow retraction system relies on damping devices to slow down the screen by 2-4 times speeding during going up. It is widely used in a workplace school or office teaching training or used as entertainment equipment such as watching movies home theater playing games karaoke etc.