The 1x4 HDMI Splitter use a single HDMI source，accessing to multiple HDMI sinks. The Splitter allows one HD source to be split easily to four HDMI compatible monitors or projectors. It also supports extra analog stereo audio output and digital SPDIF audio output. And the user can do choose the video mode output at the three video mode：3D mode, 4K x 2K mode and Pass mode and choose the audio output mode at the three audio mode: 5.1CH mode