2.1 Tower speaker 1, RMS:30W+10W*2 2, Driver unit:5.25"+3"*2 3, With USB/SD,FM,Karaoke 4, ... Knob control volume 2.1 Tower speaker system with VFD displayFeatures:1, Used ... volume more suit well.5, Can add karaoke function Specification:1,Output power:30W+10W*2(RMS)2,Speaker driver:woofer5.25inch,satellite3inch ...