"PhatNoise's patent pending SSA interface is unlike any other interface available for the car. Using voice prompting, the PhatNoise Car Audio System reads album, artist, genre and playlist names to you while you drive....In addition to these great features there is a voice prompted help that is always available at the touch of a button. Then you can turn it off once you get the hang of the system."

Taken from here: http://www.phatnoise.com/products/systemoverview/headunit_interaction.php