iSimple ISFM23 TranzIt Universal Bluetooh Enabled FM Transmitter Car Kit, Blue

I fitted this to my Nissan 350Z which has no bluetooth or Aux. Installation of the unit itself and the app for controlling it was simple, but that was the end of the good news.The amount of hiss you makes it unusable. Quieter tracks are unlistenable due to the hiss.I tried numerous unused FM frequencies, all with the same result.Much worse than any cassette or FM adapter I have ever tried.Unfortunately I fitted it after the amazon return period otherwise I would have sent it back.In short, a complete waste of time and money.