JD-8 is a broadcast system to transmit AV signal (Audio + VGA) by UTP Cat5e cable up to distance 500m from the cpu. You can connect PC, KVM switch, matrix AV switcher, or use optional adapter to connect DVD or other multimedia output devices. It can simplify the installation and reaches a longer distance. It can be used in the device extension of projector, plasma TV, LCD TV, LCD monitor, HDTV, and CRT and in the area of public broadcasting.