What are the features of the atari 5200 controller

The atari 5200 controller was one of the first controllers to have a pause button. It also have two buttons at each side, usually to shoot enemies. On the face of the controller was a numeric keypad, much like the Collecovision and the Intellivision controllers. Another very "appealing" feature of the Atari 5200 controller is that it it probably wont work. Atari 5200 controllers pretty much never work, which is why you would have buy a third party controllers an alternative. Good Answer?