... in USB and SD memory card function, Support MP3 music format2. Nice VFD display 3. Volume, bass, ... 5. hot selling model by 2010-2011yearSpecification:2.1CH home theatre with remote controller 1,Output power ... :30W+10W*2(RMS)2,Speaker driver:woofer 4 inch,satellite3inch* ... 692*370*675mm/4sets Quantity:1550sets/40HQ 2.1 Piano home theater system speaker ,With usb ,sd ,vfd ...