... 4, Key button with remote control 2.1 Ch USB multimedia SpeakerFeatures1,USB/SD card support mp3/4/5 format ... , can add wma format, vedio play.2,Can ... any where.Specification:1,Output power:30W+10W*2(RMS)2,Speaker driver:woofer5.25inch,satellite3inch*23,Frequancy ... :651sets/20gp,1116sets/40ft,1581sets/40HQ 2.1 Ch USB multimedia Speaker