Battery: Built-in rechargeable lithium ion battery
Power: Charging via FireWire, USB 2 (high power) or power adapter
Playtime: Up to 15 hours of music; up to 5 hours of slideshows with music
Operating Temperature: 32 to 113 deg. F (0 to 45 deg. C)
Storage Temperature: -4 to 158 deg. F (-20 to 70 deg. C)
Relative Humidity: 5% to 95% noncondensing
Altitude: 10,000 feet (3000 m)
History: On June 28, 2005, Apple Computer merged the iPod and iPod photo lines, removing all grayscale models from the main iPod line, giving the 20 GB iPod all of the capabilities of the former iPod photo line for $299 U.S., the same price as the previous grayscale version. The price of the 60 GB iPod photo, now known as iPod 60GB, dropped from $449 U.S. to $399 U.S., and Apple discontinued the $349 U.S. 30 GB iPod photo model. Apple Computer — as well as prominent fan sites (such as iLounge) — continued to refer to this lineup as fourth-generation iPods. Along with the new lineup, Apple also updated iTunes to version 4.9, which added podcasting capabilities to iTunes and to iPod.
History Source: Wikipedia
History Source Address: http://en.wikipedia.org/wiki/IPod