The African Stereo Network Company (AFSTEREO) was established in 2004 and is the leading African supplier of real time radio and television advertising and music data to the media, marketing, research, auditing, regulatory and music industries. Utilising USA-patented AirCheck technology, for which it has the exclusive African rights, the company tracks all commercial and music airplays 24 hours a day on 33 radio and television stations across South Africa.