4-port HDMI Splitter Box allows a single HDMI input to display simultaneously on 4 HD Displays such as HDTV or Projectors (Mirror Screen)It comes with external power adapter to maintain the HD input resolutionIt supports the Blu-Ray, Sony PS3, MS Xbox, HD-DVD, HD-DVR. Supports 1080p resolutionPlug and play, no extra driver neededVideo formats supported - DTV/HDTV: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p