IPod nano (2nd generation)

On September 25, 2006, Apple updated the Nano line. The second-generation Nano featured scratch-resistant, anodized aluminum casing like the earlier Mini's design; the multiple color choices mirrored those of the Mini as well. However, unlike the first-generation Mini, the button labels were grey instead of matching the Nano's casing (except for the black Nano, which had a black click wheel). The second-generation Nano featured a 40% brighter, "more vibrant" display,[9] a battery life upgrade (from 14 to 24 hours), and storage sizes doubled to 2, 4, and 8 GB models. The second generation also introduced gapless playback of audio files, along with a new search option.

The 2 GB model was available in silver only. The 4 GB was initially available in green, blue, silver, or pink, and the 8 GB model was initially only available in black - red was later added for 4 and 8 GB models. Apple claimed that the second generation iPod Nano's packaging was "32% lighter with 52% less volume than the first generation",[10] thereby reducing environmental impact and shipping costs.

On October 13, 2006, Apple announced a special edition iPod Nano; Product Red, with a red exterior and 4 GB of storage. For each red iPod Nano sold in the United States, Apple donates US$10 to the Product Red initiative, while retaining the regular price.[11] On November 3, 2006, Apple introduced a red 8 GB model, due to "outstanding customer demand", again retaining the same price point of the equivalent black model.

Source https://en.wikipedia.org/wiki/IPod_Nano