... cases IC 2030*3 USB/SD CARD READER, RC 2.1 HOME THEATER SYSTEMFrequency response: 40Hz-150Hz, 150Hz-20KHzOutput Power: 30W+ ... 10Wx2 Speaker Unit:woofer5.25" Satellite(3"+1.5")x2 S/N: ≥70dBP.M.P.O.: ... treble knobs on sideUsage: Home Theatre,Stage,Portable Audio Player,USB, SD, PC, laptop, DVD, VCD, CD with music ... x L): 200x 115 x 130mmProduct Picture: 2.1 Multimedia Home Speaker Theater System