31. Microphone Input2. AUX Input (Line In)3. USB Input4. TF (microSD) Input5. DC IN (DC 5V, 1A Charging Port)6. Power On/Off Switch7. Mode Button (USB/TF/FM/BT/AUX)8. Play / Pause / Hands Free Phone Call9. Display10. Next / Volume +11. Previous / Volume –