iPod nano (original, 4 GB, white, 2005)

The iPod nano replaced the iPod mini as a full-featured alternative to the classic iPod at the time. The iPod nano featured 1, 2, or 4 GB of flash memory in a 3.5-inch tall, 1.6-inch wide, and 0.27-inch thick white or black case. The color screen measured 1.5 inches at 176×132. The iPod nano is navigated by a Click Wheel and supports viewing photos. The design of the case features a jet black or iBook white front and stainless steel back.

Software functions included Screen Lock, a stopwatch, and a world clock. The iPod nano held approximately 240, 500, or 1000 songs and up to 15,000 or 25,000 photos that were downsampled to fit on the 1.5-inch screen.

Source: EveryMac.com

iPod nano Generation 2 (4 GB, green, 2006, unopened)

The iPod nano Generation 2 was available in 2 GB, 4 GB, or 8 GB flash memory capacities, capable of supporting either 500, 1000, or 2000 songs. In addition to songs, it could hold up to 25,000 photos on its 1.5 inch (diagonal) LCD display.

The 2 GB model was only available in silver; the 4 GB model was available in silver, green, blue, and pink; and the 8 GB model was only available in black.

Source: EveryMac.com

iPod nano Generation 6 (8 GB, 2010)

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.

Source: EveryMac.com

iPod nano Generation 5 (16 GB, blue, 2009)

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.

Source: EveryMac.com