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.
Source: EveryMac.com