... : RMS 6W.2. Frequence response: 150Hz-18kHz (±3dB).3. Signal to noise ration(SNR): ≥80DB.4. Loud speaker: 1.8 inch ... ).5. Magetic resistant: 4Ohms.6. Sopport: USB and SD card.7. Color selectable: blue, pink, green, silver, black, ect.8. FM ... cable. Portable Micro SD mini Speaker (just for mp3 mp4 tablet pc ,mobile phone,USB flash driver, SD card ,TF card etc ...