HDMI 2x4 Matrix with IR Remote Control Extension, 3D IR remote control adapters (110512, 110513, 110514) are sold seperately. ** 110511 is a true matrix 2 x 4 switch, up to 2 source devices and up to 4 displays can be connected. You can have the same video mirroed on all displays, or use the switch to send different video to each monitor. Input source for each display is selected by pushig button on HDMI matrix box, or using remote control. IR Extension function allows you to extend remote control IR signal through HDMI cable. Say you have a TV and cable box in the living room, and second TV in the bed room upstairs. You can change cable channel either in the living room or on the bed upstarirs with the cable box remote control. You do not have to go downstairs each time you want to change cable channel True matrix 2 x 4, (2 input / 4 output) HDMI version: High speed with 3D support