ipod shuffle的英文介绍，500字就行

The iPod Shuffle trademarked as iPod shuffle is a digital audio player designed and marketed by Apple Inc. It is the budget model in Apple's iPod family. It was announced at the Macworld Conference & Expo on January 11, 2005, using the tagline "life is random". Instead of storing data on a hard disk, it was the first iPod to use flash memory. The current third generation model, introduced on March 11, 2009, weighs 10.7 grams 0.38 ounces, making it Apple's smallest digital audio player.