The USB Type-A connector is by far the most common. The new USB 3.0 Type-A connectors are very similar in appearance to USB 2.0 connectors. The new version is slightly longer than its predecessor to accommodate the five additional Super Speed connection pins located in the rear of the connector. USB 2.0 and USB 1.1 devices are fully electrically and mechanically compatible with USB 3.0 ports and connectors. However, they will not achieve USB 3.0 speeds or take advantage of USB 3.0 features. USB 3.0 devices are fully compatible with USB 2.0 and USB 1.1 ports and connectors, but will not run at Super Speed. To gain the Super Speed advantage, USB 3.0 devices with USB 3.0 cables in a USB 3.0 port with USB 3.0 host controller must be used.