"The Sirius S50 is the first, and for now, the only portable player that lets you listen to Sirius Satellite radio programming—sort of. It plays live channels only when connected to the Car Kit or Home Kit dock; when used as a portable, it relies on songs and radio programs recorded in its 1GB of internal flash memory. It's a limitation you learn to live with. If you're a Sirius subscriber and want to tote your tunes, the S50 is the way to do it." This product definitely is not what I would have thought it would be. I really expected a portable receiver. Still this is kind of cool in that you can choose to download individual songs to it when you hear them by just the click of a button.