Excellent price / quality ratio. Having a vehicle aged 10 years, I could play music in MP3 therein. Although not a high-end, this device is as good or better than players / transmitters 50/80. Advantages: SD card slot, USB socket wrench, jack for MP3 / MP4 player. On the branch, its frequency is chosen, we hold the car radio on the same frequency ...... and it works. Caveats: scrambled during transmission antenna relay highway approach including the 87.5 FM frequency disrupts the location on my GPS TomTom, disturbance eliminated by use of the frequency 108.00, Infrared remote control ineffective.