Mark said that it contained a trak ball, 2 joysticks, 28 buttons and two suction cups. He said that the Trak-Ball felt like one you would find in an arcade machine, and said it works well with Slither. He also said it was almost as big as the system itself. He notes to power it, it passes through the ColecoVision power supply. He said it has a lot of cable. He recommends it.