I have seen so many like this but never had one before. The wirelsess bluetooth Fm transimitter car charager, radio adapter mp3 player, hands-free car kit. I am big samsung fan and this one works perfect with s7. It is just like my bluetooth headset but with more fuction that i can use for vairous enviorment. It is up to 32g of SD card space for my favorite music. what is great, instead of lagging between call and muisc, I can easly swith both mode. i can really enjoy Fm87.5-108MHZ full channels as well as play MP3 with this device. And the LED dispaly really make this product sharp. Great prodcut for my Toyota.