Below the general summary information, you'll find a handful of options for how the iPod syncs with your computer. Oddly enough, there are more options in this menu than with any other iPod.
For the iPod Shuffle there are three important options to be aware of. First, the Enable Sound Check box will ensure that all songs on the Shuffle are adjusted to play at a consistent volume. We usually sneer at the idea of iTunes meddling with how loud our music is, but if you're using the Shuffle for working out or just don't like the idea of messing with the on-ear volume controls, Sound Check comes in handy.
On that same note, the Limit Maximum Volume slider down at the bottom comes is useful, especially if you're worried about a child playing music too loud or if you want to use this with a pair of headphones that don't have Apple's special volume control clicker.
Finally, there's the Manually Manage Music option. Check this if you want direct control over what music and playlists get synced to the Shuffle.