Gefen EXT-DVI-441DLS 4x1 DVI DL Switcher (Serial Control) Switches easily between any four dual link DVI computers with USB 2.0 and saves you money on hardware costs Maintains highest 3840 x 2400 resolution dual link video and supports resolutions up to 1080p, 2K, and 3840 x 2400 Use either PC or Mac USB 2.0 keyboard/mouse Discrete IR remote (included), Contact closure remote control option (RMT-4) and Serial RS-232 remote port Installs in minutes and it rackmountable