inputs.text: not much - first got transmitter impressed fact getting great little transmitter 10 bucks however little guy lasted 2 weeks two weeks transmitter started acting giving alot static hissing whatever reason not plug car not give clear signal think something poor grounding regardless think power cable started crap would charge intermittently signal quality got worse worse regardless frequency worked great 2 weeks though considering awesome amazon return policy think worth dont want deal hassle steer clear guy