The Elgato Game Capture HD is a video capture device that allows users to record high definition gameplay footage from various gaming consoles. It has four ports and is compatible with both USB 3.0 and USB 2.0 ports. The device supports broadcast formats such as NTSC-M and ATSC, and has external interfaces including Component BNC Output, Composite RCA Input, HDMI Standard Output, S-Video Input, USB 3.0, and USB 2.0. It is compatible with universal brands and specific products such as Apple MacBook Air, Acer Aspire, and Apple MacBook Pro.