Features: 1. Volume / bass control 2. RGB led backlight. 3. Power input USB 5V 4. Speaker RMS: 11W 6. Speaker Unit Size : 4inch + 2inch x 2 7. Frequency : 150Hz~20KHz 8. Signal to noise ratio : ?30db 9. Product size : 230 x 130 x125 mm, 72 x 82 x 120 mm 10. Materials: Plastic + wooden