It only works with certain games. As far as what it is, you use it instead of your mouse. Like I said earlier, its a haptic device, which means adds tactile feedback to games. For example, adding texture to objects. In Penumbra, the ball gets harder to move when you're interacting with a heavier object, or in HL2 when you're using the gravity gun. Also, I got the gun attachment, which adds recoil to the game. It's really beyond explanation, you kind of just have to use it to really understand it.