Many equipment on the market now have the “multi-screen interaction” function, and the most commonly used by users is the film and television projection screen. The images on mobile phones, tablets and other devices are projected onto the TV through a wireless connection. Enhance the movie viewing experience. Sometimes, the screen is too small to watch a play on a mobile phone. Even a large-screen mobile phone can’t compare with a tens of inches of TV. Sometimes you need to cast photos and videos from your mobile phone to a TV, or to cast content to a large screen during a meeting. You also need the “cast screen” function.