This device records content from over 42,000 Internet radio stations when connected to a home computer, for later playback in a car. Once plugged into a computer using the included USB cable, its software uses your home Internet connection to record selected Internet radio stations from around the world. The device's built-in 2 GB memory holds up to 45 hours. The device then plugs into a car's 12-volt power socket and transmits content to your car's radio over an unused FM frequency (can also plug into car stereos with auxiliary inputs using the included cable). The device's display and remote allow easy navigation of stored songs, talk, sports, or podcasts. Works with Windows 7, Vista, XP, or Mac. 5" L x 1 1/2" W x 1 1/4" D. (1/4 lb.)