HDMI is the newest video and audio interface that meets the HDTV requirement. The video and audio connection is made with one cable, and supports the highest video resolution up to 1080p. There are many video and audio devices that provide the HDMI interface, such as DVD players, HD-DVD, Blue-Ray DVD, PlayStation 3, satellite receivers, and home theater systems, but many HDTV's only have one HDMI input. The AITech 4-Port HDMI switch box is the answer. Connect up to 4 HDMI devices to any HDTV with an HDMI input.