Product description: 1. DC3.7 Power supply (dual MOS battery) recommended 1-3A 2. Support FM radio function, automatically search for radio stations and store 3. Support AUX input function 4. Support full function operation of infrared remote control 5. Support LED digital screen real-time display of full function status 6. Support USB / TF / radio / AUX automatic switching 7.mp3 / WAV / WMA song decoding chip 8. Support FAT16, FAT32 file system 9. Support 32-320kbps mp3 songs 10. Support power-off memory function: memory song and volume before power-off 11. Voltage input :5V