On the top of the controller is a row of four numbered LEDs, which are used to identify and distinguish multiple wireless controllers. These are similar to the indicators found on the Wii remote and the ring of light Xbox 360 Controller. Since the PlayStation 3 supports up to 7 controllers, but the controller only features 4 LEDs, controllers 5, 6 and 7 are represented as the sum of two other indicators (for example controller 5 is represented by illuminating indicators '4' and '1' at the same time, since 4+1=5).[19] Sony also patented a technology to be able to track the motion of these LEDs with the PlayStation Eye camera for use alongside the PlayStation Move Controller.[20] Though this was never utilised with the DualShock 3, its successor, the DualShock 4, features a light bar used for motion tracking, as well as player identification.