Here’s what I have gathered from testing some cameras: the original cameras are Sony branded and are black & white NTSC composite video cameras with a piece of IR filter acrylic on the lens.They run off 12 volts DC. All regions, even PAL regions use this NTSC 60hz camera. They do have adjustable pots so brightness levels can be turned down or up. That’s something modern CCD cameras, especially cheaper ones don’t have. I have tested color cameras and they don’t work as well as they pick up surrounding light sources. Vampire Night and Crisis Zone use one camera. For Time Crisis 3, each player uses one camera. So, if you want a two play setup, you will need two cameras, two I/O boards, and two guns. For Crisis Zone, you’ll need one camera, one I/O board, and one gun. For Vampire Night, you’ll need one camera, one I/O board, and two guns.