1.Manufacture 2.FM function 3.USB,SD card reader 4.OEM service 5.Magnetically shielded 2.1 HOME THEATER SYSTEMFrequency response: 40Hz-150Hz ... .5")x2 S/N: ≥70dBP.M.P.O.: 1200W Distortion: 0.3% 1W 1KHzPower:AC220V/50HZFunction: Volume, bass, treble knobs on ... sideUsage: Home Theatre,Stage,Portable Audio Player,USB, SD, PC, laptop, DVD, VCD, CD with music back and ...