... , PSP, etc, supports USB, SD card, MP3/WMA files, with built-in FM radio (option). • Support: USB, SD card, mp3, WMA files• Can ... • Output power: the RMS 3W x 2• Frequency: 100HZ - 18KHZ• Speaker: Φ45mm x 2 /4Ω• S/N Ratio: ≥75db• Material: ABS ...