The HD15 BreakThrough is a two-sided circuit board with an HD15 VGA connector on one side with 5 BNC's on the other. The HD15 BreakThrough is great for the installation market -- plug in a computer and the signal is carried on a 5-wire RGBHV cable. Installation technicians will save time installing crimp-on BNC connectors instead of field-soldering 15-pin connectors. The HD15 BreakThrough has a short-to-ground on Pin 4 so laptops will recognize an external monitor upon start-up.