... or SD/MMC card, enjoy music via car stereo. Car FM Transmitter with panel button 1. Read MP3 files from USB flash disk ... or SD/MMC card, transmit music signal over car FM tuner, then enjoy music via car stereo. 2. Support external ... remote control. 6. 206 FM channels. 7. Blue LCD screen display song name, more beautiful and clear. 8. Horizontal distance of transmitter: >10m.