The iPod Touch is a multipurpose pocket size electronic device designed and marketed by Apple Inc. with a user interface that is touchscreen-based. It can be used as a music and video player, digital camera, handheld game device, and personal digital assistant. It connects to the Internet only through Wi-Fi base stations, does not use cellular data, and is therefore not a smartphone, though its design and iOS operating system are very similar to the iPhone. As of May 2013, 100 million iPod Touch units have been sold. All models of the same generation typically consist of identical features, processors, and performance, in addition to available operating system upgrades, differing only in outer color and internal storage space. An exception was the fifth generation, as the first version of the low-end model was sold without a rear-facing iSight photographic camera and lacked the iPod Touch loop. However, on June 26, 2014, the 16 GB model was refreshed to include the rear-facing camera and more color options. The prices for every iPod Touch model were also dropped.