Original: The Kindle 2 features 16-level grayscale display , improved battery life , 20 percent faster page-refreshing , a text-to-speech option to read the text aloud , and overall thickness reduced from 0.8 to 0.36 inches ( 9.1 millimeters ) .
Simplified: The Kindle 2 features grayscale display , improved battery life , and overall thickness reduced .