The Dualshock 4 has a great big light on it. It was one of the first things announced about the controller and there are basically three functions behind it. You can differentiate between players, it interacts with the camera and, in certain games, it's utilized by devs as a kind of secondary output. Killzone, for instance, shows your health status via this little light. Suddenly, people are asking why any of this matters, and are begging Sony to let them turn it off.
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