Jupiter Jack is an easy to use device that turns your car radio into a hands free speaker phone! It's easy to use. Simply plug Jupiter Jack into your cell phone’s headset jack and tune your car radio to 99.3 FM and start talking hands free! It’s that simple! Jupiter Jack features a built in microphone that transmits your voice clearly while you hear your caller’s voice clearly through your car’s speakers. Using a cell phone without a hands free device may not be safe an....
