StarTech.com 4x4 HDMI Matrix Video Switch Splitter with Audio and RS232 - 4x1 HDMI Video Switch - 4 Port HDMI Switcher (VS440HDMI) - Video/audio switch - desktop - for P/N: ST121HDBT20L, ST121HDBT20S, ST121HDBTL, ST121HDBTPW, SVA12M2NEUA, SVA12M5NA

Share and switch four distinct HDMI audio/video signals between four displays. The VS440HDMI 4x4 HDMI Audio/Video Matrix Switch/Splitter (with Audio and RS232) lets you share up to 4 distinct HDMI or DVI inputs (using HDMI to DVI adapters - not included), with audio, between 4 independent displays or projectors.
Providing convenient front push-button and RS232 PC software control, this matrix switch allows each input and the corresponding audio to be switched individually, meaning that different A/V sources can be shown on each output, or a single source can be output to several offering maximum flexibility.
The switcher features a front panel LCD display for easy status monitoring, plus an included remote control and IR extender module for simple control from a distance.
Designed to provide maximum functionality while saving space, the HDMI Video Matrix Switch can be used as a standalone solution or rack-mounted using ear-mounts (included).