IOGEAR 4-Port Dual-Link DVI KVMP Switch with 7.1 Audio and Cables, TAA Compliant, GCS1784 One console controls four computers .2-port USB 2.0 peripheral hub [ backward compatible with USB 1.1 ] IOGear's Display Emulation Technology reads and remembers the monitor's parameters (EDID) so the user doesn't experience delays Share a 7.1 audio surround sound system Full support for DDC, DDC2, and DDC2B monitors Firmware Upgradable TAA Compliant Up to 4K UHD 3840 x 2160 @30Hz resolution when used with IOGEARs GHDDVIC4K3, 4K sources, and 4K monitors