Key Digital KD-4X4 HDMI Matrix Switcher 4x4 Full HDMI matrix switching between 4 HDMI/DVI sources and 4 Displays or Zones at any time and in any combination Supports all SD, HD, and VESA (VGA, SVGA, XGA, WXGA, SXGA, UXGA) resolutions up to 1080p (60Hz & 50Hz): Supports lossless compressed digital audio: Dolby TrueHD, Dolby Digital Plus and DTS-HD Master Audio Internal EDID Library features 6 default EDID configurations, in addition to Native EDID data for any Output/Display Light Buffer Technology