Widely used for digital entertainment center HDTV retail and show site HDTV STB DVD PS3 and Projector factory space and security concernsdata center control distribution conference room prosentation school and corporate training enviroments.NOTE:Not 4 inputs 1 output hdmi switch (No bidirectional transmission function). Just duplicate or mirror one single HDMI source on four HDMI displays. 4 displays will show the same video and audio simultaneously.NOT support 4K@60HzNo extend function. How to use1. Connect the HDMI input source into the HDMI Splitter Box Input port. (HDMI Input cable).2. Connect the HDMI output enquipments into the HDMI Splitter Box output ports. (HDMI Output cables ).3. Insert the DC side of 5V power supply into HDMI Splitter Box and then connect the AC side of the power supply into the wall outlet.Attention: Insert / Extract cables gently.Tips1x4 hdmi splitter with 1 input port and 4 output ports can distribute/duplicate one signal source to 4 hdmi displays or 4 separate HDTVs simultaneously without any loss in quality.( Note: NOT 4 input 1 ouput switcher can t switch 4 signal source to one display).Hdmi cable NOT included