The Xbox 360 features three USB 2.0 ports (two on the front, one on the back). The Xbox 360 S, however, has five USB 2.0 ports (two on the front, three in the back) along with a dedicated Kinect port. The Xbox 360 E has four ports (two on the front, two on the back) and a dedicated Kinect port. These are used for connection of accessories such as wired controllers, the wireless networking adapter, the Xbox Live Vision camera and USB storage devices. Although the number of wired controllers is limited by the number of ports, up to four may be used through the use of a USB hub.