Most high-definition audio/video components utilize the HDMI interface to provide crystal clear, digital sound and picture. With the wealth of devices now using HDMI, it's easy to run out of free HDMI inputs on your TV set or receiver. The 4-Port HDMI selector switch solves this problem by providing additional high-definition digital inputs for sources such as DVD, Blu-ray, gaming systems, and high-definition cable/satellite boxes.