I read the previous reviews about the Belkin TuneBase FM Transmitter for Zune and they had mostly rated the device very poorly. One review did say the audio output using a cassette adapter worked fine, so I bought the product to use it in that way and not even try the FM transmitter. Well, the audio output didn't work at all. Furthermore, the device is only built to fit the 1st generation Zunes. I have a 2nd generation 8GB zune and an 80GB zune. The 8GB zune fit on the device, but not well - it was kind of wobbly. The 80GB zune doesn't fit at all. Save your money and don't purchase this device.