It is used to convert vga video and 3.5mm analog audio signal in your computer to hdmi signal and display it on the large screen of the hdtv 1080p or 720p output selectable via switch; plug and play supports vga input resolution (at 60hz): 640x480, 800x600, 1024x768, 1280x720, 1600x1200, 1920x1080 pixels enable hdtv to connect computer, notebook, dvd or other devices with vga interface; no software driver needed