Trying to hook up my 2 monitors with a splitter and they wont extend only duplicate?

[Carsonx]

I have 2 LG 25UM56 but when I hook them up to my MDMI splitter they will only detect one and the graphics card? I've never used 2 monitors and even when I hit extend they will stay duplicates. looked all around cant seem to find anything that works. :|

My monitors: 25" Class 21:9 UltraWide® IPS LED Gaming Monitor 25UM56-P

The Splitter: RadioShack 3-In / 2-Out HDMI Matrix Selector

 

[kanewolf]

If you ran two HDMI cables from your computer then you could use that matrix splitter. Running a single HDMI from your computer will only allow you to duplicate the same information on two screens.

To get an extended display requires two output cables from your computer. If you have two output cables there is no need for the matrix splitter.