Backlight for behind the screen, fits 27-inch screens. Comes for PC monitors. It has more than one mode and its own special program. It has the feature of interacting with the screen, meaning the color that appears on the screen, you see it on the backlight, it gives an atmosphere when you watch a series, movie, or even when you play. And it has the sound feature, it interacts with its surroundings, whether it's a song or something, it interacts with it. It hasn't been with me for 8 months, and most of the time it was off. The reason for selling is that I don't use it much.