The Kindle NUMBER@1 features 16-level grayscale display , improved battery life , NUMBER@2 percent faster page-refreshing , a text-to-speech option to read the text aloud , and overall thickness reduced from NUMBER@3 to NUMBER@4 inches -LRB- NUMBER@5 millimeters -RRB- .

The new Kindle features improved battery life , NUMBER@2 percent faster page-refreshing , a text-to-speech option to read the text out loud , and overall thickness reduced from NUMBER@3 to NUMBER@4 inches -LRB- NUMBER@5 millimetres -RRB- .
