... USB/SD,FM,Karaoke 4, Knob control volume 2.1 Tower speaker system with VFD displayFeatures:1, Used for DVD/CD/TV ... all audio device.2, With dance VFD display screen make apperence very nice and elegant.3, Telescopic antenna digital FM radio looks ... add karaoke function Specification:1,Output power:30W+10W*2(RMS)2,Speaker driver:woofer5.25inch,satellite3inch*23,Frequancy response:220HZ-50KHZ4 ...