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 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.
The iPod nano Generation 5 was notable because of its impressive color choices. This model was available in nine colors: (PRODUCT) RED Special Edition, pink, orange, yellow, green, blue, purple, silver, and black. The finish for the generation 5 nano is glossy and the case is made of aluminum and glass. It was available with 8 GB or 16 GB of flash memory (2000 or 4000 songs).
This iPod nano also features a video camera with an integrated microphone and speaker that takes advantage of its high-quality 2.2″ TFT display (240×376, 204 ppi). The video quality is H.264 VGA 640×480 at 30 FPS with AAC audio, but it cannot take still photographs. This iPod also has a built-in FM Radio with “live pause,” allowing pause and rewind up to 15 minutes.
My example is blue, and I remember using it as a back-up/additional video camera that had surprisingly good audio for its size.