Intelligent Video Matrix 4x4, with audio, 4 x VGA+Audio Input <=> 4 x VGA+Audio Output 350 MHz, 1920 x 1440 at 85 HZ Description: Through the video/audio matrix DC-48101, you can display / play different images / audio signals to 4 screens / speakers (or earphones) through 4 PC. And you can also control the source of image / audio by selecting PC signal source 1 ~ 4 or turning off source input. Video/Audio matrix is ideal for ,test bench facilities, data center, help desks, video broadcasting, presentation, stock quotes, timetables, educational facilities, etc. Features: *Intelligent functionality *Can be cascaded *With 350 MHz pixel frequency, supports the DDC, DDC2, DDC2B *Support VGA, SVGA, UXGA, QXGA resolutions *Support Multi-Sync video type include RGBHV, RGsB, RGBS *Support synchronous Include positive, negative; TTL or 1Vpp level *Four sets of 7-Segment LED can indicate the input setting status of input port quickly *The output is compatible with standard VGA card *Extends the video signal up to 65 meter (213 feet) *The switches on panel can select PC signal source 1 ~ 4 as OUT 1 ~ 4 or turning off any signal I/O port / all I/O ports