... , mp5, cell phones, PSP, etc, supports USB, SD card, MP3/WMA files, with built-in FM radio (option). • Support: USB, SD card, mp3, WMA files• Can connect laptop ... 2• Frequency: 100HZ - 18KHZ• S/N Ratio: ≥80db• Material: ABS • FM (Optional) Fashionable Mini MP3 Speaker, support SD card, built-in FM Radio (Optional)