There's nothing quite like listening to music in your car while driving with the windows down. But sometimes we want to play a specific song, listen to a certain podcast or an audio book. That's when you need this application FM radio transmitter has an easy-to-read display with intuitive buttons for adjusting frequency,so you can charge devices while driving. For best performance, we recommend using lower channels in the 80s and 90s. with this application you don't need a machine to lisent to music it's free and 100% working