... .4. Loud speaker: 1.8 inch (external diameter: 45mm).5. Magetic resistant: 4Ohms.6. Sopport: USB and SD card.7. Color ... selectable: blue, pink, green, silver, black, ect.8. FM radio function.9. Accessories: 1 battery and 1 USB cable. Portable Micro ... SD mini Speaker (just for mp3 mp4 tablet pc ,mobile phone,USB flash driver, SD card ,TF card etc