Here’s review from  iPod Shuffle 2G,  This new ipod come with 1GB of internal memory, a built-in clip, and up to 12-hours of continuous audio playback into a sleek 0.5-ounce package.

The second-generation iPod shuffle is impressively small, and the built-in clip makes it ideal for working out, running, or just casual listening. Its lack of a screen or any extras like an FM tuner—or even support for many iPod accessories—is countered by its impressively diminutive size and low price 

via techeblog.com