This complete package gives you all you need to update your neck and back extension machines. With our software and some LCD monitors you will have the dream clinic that will impress your patients and your staff. Everything is included: cabling, video splitter, trackball, monitors and mounts, high powered computer with two hard drives, and our 2.1 version program. All you have to do is plug your neck and back machines into their respective ports on our USB interconnection box, fire up the computer, calibrate, and you're off and running.