Image Courtesy of Apple

Apple's Summary:
Take everything you love about iPod and shrink it. Now shrink it again. With 2GB (500 songs) and 4GB (1,000 songs) models starting at $199, the pencil-thin iPod nano packs the entire iPod experience into an impossibly small design. So small, it will take your music places you never dreamed of.

Technical Specs:

Capacity

* 2GB or 4GB flash drive(1)
* Holds 500 to 1,000 songs in 128-Kbps AAC format(2)
* Holds up to 25,000 iPod nano-viewable photos(2)
* Stores data via USB flash drive

Display

* 1.5 inch (diagonal) liquid crystal display with blue-white LED backlight
* 176 x 132 pixel resolution, .168-mm dot pitch
* Support for display of multiple languages and characters simultaneously

Audio

* Skip-free playback
* Frequency response: 20Hz to 20,000Hz
* 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
* Upgradable firmware enables support for future audio formats

Headphones

* Earbud-style headphones with 18-mm drivers using Neodymium transducer magnets
* Frequency response: 20Hz to 20,000Hz
* Impedance: 32 ohms

Mac system requirements

* Macintosh computer with USB port (USB 2.0 recommended)
* Mac OS X v10.3.4 or later

Windows system requirements

* 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

Customizable settings

* Customize main menu
* Create multiple On-the-Go playlists
* Adjust audiobook playback speed
* Clicker playback through headphones
* Rate songs
* Shuffle songs or albums
* Repeat one or all
* Sound Check on or off
* 20 Equalizer settings
* Backlight timer
* Display contrast
* Alarms on, off or silent
* Sleep timer
* Date and time
* Display time in menu bar
* Contacts sort and display by first or last names
* Clicker on or off
* Languages: Czech, Danish, Dutch, English, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese and Turkish
* Additional language support for display of song, album and artist information: Bulgarian, Croatian, Romanian, Serbian, Slovak, Slovenian and Ukrainian

Environmental requirements

* Operating temperature: 32° to 95° F (0° to 35° C)
* Non operating temperature: -4° to 113° F (-20° to 45° C)
* Relative humidity: 5% to 95% noncondensing
* Maximum operating altitude: 10,000 feet (3000 m)

Input and output

* Dock connector
* 3.5-mm stereo headphone jack

Power and battery (3)

* 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
o Fast-charge time: about 1.5 hours (charges up to 80% of battery capacity)
o Full-charge time: about 3 hours

Size and weight

* Height: 3.5 in
* Width: 1.6 in
* Depth: 0.27 in
* Weight: 1.5 oz