Replacing the “squat” design of the Generation 3, the iPod nano Generation 4 returned to a “skinny” design similar to its predecessors. The new wraparound curved aluminum and glass case was offered in an unprecedented nine colors: silver, black, purple, blue, green, yellow, orange, pink, and (PRODUCT) RED Special Edition. The display was a wide-format 2-inch (diagonal) color LCD display at 320×240.
The iPod nano Generation 4 used either 8 GB or 16 GB of flash memory, capable of storing 2000 or 4000 songs, 7000 or 14,000 photos, and 8 hours or 16 hours of video. All colors were offered for both capacities.
The iPod nano Generation 4 features included an accelerometer (automatically switched to “Cover Flow” navigation in landscape orientation), games and videos only played in landscape, a new Genius feature to dynamically create playlists, and shake-to-shuffle for songs. Accessibility options were added including larger text and spoken menu items. It also included Nike+iPod support, FM radio tagging (using the Apple Radio Remote), support for audio crossfade, and games including Maze, Klondike, and Vortex.
The iPod nano Generation 3 used a design unique to the iPod family with “squat” proportions in a thin case. It was available in 4 GB or 8 GB versions, with the 4 GB model offered only in silver, and the 8 GB models offered in silver, light blue, light green, black, and (PRODUCT) RED Special Edition, and later pink option was added. All models had a chrome stainless steel back.
Compared to the iPod nano Generation 2, the Generation 3 added a larger 2-inch (diagonal) color LCD display at 320×240 resolution, support for video on the internal display, and video out via the dock.
The software is greatly improved with enhancements including a Cover Flow option for selecting albums. Three games were also bundled: iQuiz, Klondike, and Vortex.
The iPod touch Generation 2 is similar in features to the iPhone 3G, but lacks phone features, mobile phone networking, GPS, and a camera. While the back of the iPod touch Generation 2 is made of stainless steel (instead of plastic), its shape is similar to the iPhone 3G.
The iPod touch Generation 2 featured a multi-touch 3.5-inch display with 320×480 resolution, an accelerometer, ambient light sensor, Wi-Fi (802.11b/g), and 8, 16, or 32 GB of flash memory.
Compared to the original iPod touch, the Generation 2 model adds external volume controls on the left side of the device, an integrated speaker, external microphone (supported via the Apple Earphones with Remote and Mic), support for the Nike+iPod Sport Kit, a Genius feature to dynamically create playlists, and shaking the device to shuffle songs.
The iPod nano Generation 2 borrowed a design concept from the iPod mini and added several more available colors: the 2 GB model was available in silver; the 4 GB model in silver, green, blue, and pink; and the 8 GB model was available in black only. It was available with 2 GB, 4 GB, or 8 GB of flash memory and stored 500, 1000, or 2000 songs.
Hardware enhancements from the original iPod nano included longer battery life of 24 hours, a brighter 1.5-inch display, and a search engine for loaded songs.
The iPhone 3G is similar to the original iPhone in functionality, but adds 3G cellular support and GPS. Although it features the same 320×480 resolution screen, the case is slightly thicker (0.02-inch) than the original, and had a plastic (rather than aluminum) back available in black or white. Both models were available in 8 GB or 16 GB, but the white iPhone 3G was only available in 8 GB.
The GPS functionality allowed the 2.0 megapixel camera to support geotagging. The iPhone 3G uses the same multi-touch interface, accelerometer, ambient light sensor, and proximity sensor capabilities as the original iPhone, except it has two proximity sensors compared to one in the original.
The back of the iPhone 3G has the most curved shape of any iPhone design to date, and has been the only “flagship” iPhone model to ship with a plastic back.
The iPod nano Generation 6 was a major design change from previous iPod nano models. This iPod nano came in silver, graphite, blue, green, orange, pink, and (PRODUCT) RED Special Edition. Its design was a square aluminum and glass case with a clip on the back and a 1.54-inch Multitouch screen.
Although its interface looks similar to iOS, it cannot run iOS applications or games compatible with previous iPod models. Its features include a pedometer, FM radio with live pause, Nike+iPod functions, VoiceOver, and Shake to Shuffle.