... , With USB/SD,FM,Karaoke 4, Knob control volume 2.1 Tower speaker system with VFD displayFeatures:1, Used for DVD/CD/TV ... /PC/MP3/MP4 and all audio device.2, With dance VFD ... )2,Speaker driver:woofer5.25inch,satellite3inch*23,Frequancy response:220HZ-50KHZ4,S/N:<75dB5,Dimension:Subwoofer150*225*270mm,satellite100*150*110mm6,Distortion:0 ...