Capacity : 4GB (1,000 songs)
Connectivity : USB through Dock connector
Skip Protection : N/A
Files Supported :

Audio formats supported : AAC (16 to 320 Kbps), Protected AAC (from iTunes Music Store), MP3 (16 to 320 Kbps), MP3 VBR, Audible (formats 2, 3 and 4), Apple Lossless, AIFF and WAV
User Settings : N/A
Display : 1.5-inch (diagonal) color LCD with LED backlight
Ports : Dock connector, stereo minijack

Power and Battery :

* Built-in rechargeable lithium ion battery
* Playtime: Up to 14 hours when fully charged(3)
* Photo slideshow with music viewing time: Up to 4 hours when fully charged(3)
* Charging via USB or FireWire to computer system or power adapter (sold separately)
# Fast-charge time: about 1.5 hours (charges up to 80% of battery capacity)
# Full-charge time: about 3 hours

Frequency Response : 20Hz to 20,000Hz
Weight : 1.5 ounces
Size (HxWxD) : 3. 5 x 1.6 x 0.27
System Requirements : Mac:
* Macintosh computer with USB port (USB 2.0 recommended)
* Mac OS X v10.3.4 or later

Windows:
* PC with USB port or card (USB 2.0 recommended)
* Windows 2000 with Service Pack 4 or later, or Windows XP Home or Professional with Service Pack 2 or later
Warranty : 1-year warranty