These electronic readers not only store books to show on a screen, they can also read them out loud.

VOA: special.2009.07.24

Instead of purchasing e-books through a single online store to read only on compatible software (i.e. books bought from the Kindle Store can only be read on Kindle apps), Google lets consumers buy books either from its store or any other online vendor that sells books in EPUB and PDF formats, and read them on any device with a web browser.

FORBES: Google's E-bookstore Has Arrived