Review Content Save me $2000. I drive a 2003 MB SL500. Older radio technology did not allow for Sirius. Dealer wanted $2000 to add a module to pull Sirius. This FM transmitter did it for under $100. Plus I can get Pandora and my iCloud music as well now. Works like a dream. Not Bad Youn have to have it close to your radio for it to work properly Super cool Great for use in a cars. No need to have cassette players in car to play from iPhone. Does not work I received a package that was already open. The app that compliments the hardware does not work. I have an iPhone 4S. It did not work for me or any iPhone 4 users who wrote reviews for the app on Apples App Store.