Apple 4GB iPod Nano - 3rd Gen (SILVER) MA978LL/A

Holds up to 1,000 songs in 128-Kbps AAC format
Holds up to 3,500 iPod-viewable photos
Holds up to 4 hours (4GB) of video

Skip-free playback
Frequency response: 20Hz to 20,000Hz

Mac system requirements:
Mac computer with USB 2.0 port
Mac OS X v10.4.8 or later
iTunes 7.4 or later

Windows system requirements:
PC with USB 2.0 port
Windows Vista or Windows XP Home or Professional with Service Pack 2 or later
iTunes 7.4 or later