The group's principal activity is to design and develop the xm radio system, which was formed for the purpose of operating a digital audio radio service (dars). The group provides audio entertainment and information programming for reception by vehicle, home and portable radios through its high-power satellites rock and roll. These satellites offer 100 channels which cover music, news, talk, sports and children's programs with clear sound and coast-to-coast coverage. Xm radios are available under the brand names sony, pioneer and alpine. The group also provides music formats and delivers a wide range of ethnic and informational programming. The group owns two fcc licenses to provide a satellite digital radio service in the United States. Radio services are transmitted through the commercial satellites.
