I purchased the XM home docking kit and tuner under the impression I could use the tuner in a portable device as well as with my home stereo system. It turns out that most, if not all, of the portable devices out there already have a built in tuner and come with a home docking station. Therefore it only makes sense to purchase the home docking kit and tuner if you don't plan on buying a portable receiver. Luckily Amazon customer service is awesome and they are taking the device back. Thanks Amazon, great as always!