mini speaker for computer

Specifications:
1. Multimedia speaker
2. SD card and U disk support
3. USB and Li-ion power supply
4. Excellent bass performance

Technique & Parameters:
1. Speaker specifications: 1.5- 4 inch
2. Ourput power: 5W
3. Frequency response: 90Hz-20KHz
4. Sensitivity: 80db
5. SNR: 80db
6. Distortion: 0.3%
7. Fade-in fade-out function, to protect the speaker from damage
8. Memory story last song when power off
9. Support and capacity SD card and U disk
10. Rechargable and replaceable battery