The 4x1 HDMI Switcher routes HD video and digital audio from any one of the four sources to display device. Four inputs accommodate the connections of 4 HD video sources simultaneously, such as cable box, satellite systems, game, or DVD players. The output sends the HD audio/video signals to a HD display. Switching is done by push button on the unit or via the IR remote that is provided with the unit. This mini switch has external IR sensor so that switch box can be placed in invisible place. This switch is equipped with IR Extension function. You can control source devices and HDMI switch box either at source device location or remote display location.