... .OEM brand 4.one year warranty Famous 5.1 home theatre speaker with usb input 1)Rated voltage:20w ,Center 18w,surround :18w2 ... Ω,center:4Ω,surround:4Ω3)Driving unit:Front :1*3''+1*1, center: 1*3''+1*1,surround: 1*3''+1*1,4)Frequency range: Front 200Hz-20Hz center ... /USB/SD card reader,12)full function remote control Famous 5.1 home theatre speaker with usb input