... THEATER SYSTEMFrequency response: 40Hz-150Hz, 150Hz-20KHzOutput Power: 30W+10Wx2 Speaker Unit:woofer5.25" Satellite(3"+1.5")x2 S/N ... :AC220V/50HZFunction: Volume, bass, treble knobs on sideUsage: Home Theatre,Stage,Portable Audio Player,USB, SD, PC, laptop, DVD, VCD, CD ... W x L): 200x 115 x 130mmProduct Picture: 2.1 Multimedia Home Speaker Theater System