CTA's Portable, Handheld and In-Vehicle Electronics Committee has developed a product mark program for audiobooks. An audiobook is any audio file or collection of audio files of primarily spoken word content that is played in a linear order. CTA has published two audiobook standards,CTA-2003-C, Digital Audiobook File Format and Player Requirements and CTA-2004, Audiobook Media and Player Compatibility. These standards cover the media, the player and how they work together to create a great listening experience. The product mark for audiobooks can be found on both compliant media and on players. This logo indicates to a consumer that an audiobook has the features described in the standards and that the player is capable of using those features. The audio book compatible mark applies to players, and the audio book format mark applies to content.