• The iPod Touch's second and third generations have subtle differences.musique image by Christophe Schmid from Fotolia.com
  
  The iPod is Apple's revolutionary portable MP3 player. Each year, Apple unveils a new iPod design or line of iPods. In 2007, it released the first generation of iPod Touch, a traditional iPod bristling with added features, including Wi-Fi connectivity, web browsing and a touch screen.
  
  

8GB Model

• The 8GB models of the second generation (2G) and third generation (3G) iPod Touch are identical, except that the price of the 3G model was slightly lower than the price of the 2G model at the time of release.
  
  

Battery Life

• The 3G model has a shorter battery life than the 2G model, presumably because of the added features and processing speed that tax the iPod's battery much more heavily than previous models. The battery life of a 2G is rated for up to 36 hours of music playback, while the 3G model is rated for 30 hours of music playback.
  
  

Hard Drive Sizes

• While the 8GB offering remained the same between the two models, the upgraded sizes did not. The 2G was offered in 8, 16 and 32GB sizes. The 3G was offered in 8, 32 and 64GB sizes.
  
  

Speed Differences

• All sizes of the 2G model had processor speeds of 533MHz, while operating with Samsung ARM processors. They also had a memory of 128MB of RAM. The 32GB and 64GB sizes of the 3G model utilize 800MHz Samsung ARM processors and 256MB of RAM.
  
  

Voice Control Support

• The major difference in features between the two generations is that the 3G iPod Touch has voice control support, which allows the user to speak commands into the Touch to navigate the music menus and features. You can ask the Touch to play songs similar to the one you are listening to, for instance. Also, the 3G iPod has a more powerful gaming chip called the "A4 Chip," which is also used in the iPhone 4 and iPad.