... +10W*2 3.Speaker unit:4"+3"*2 4.Electroplating Knob 5.Support usb ,sd card ,vfd display ... channel can be adjusted independently3.full function USB&SD card interfaces,support different kinds of music ... .key button with remote control is convenient for placing5.connect with TV/DVD/Video/Computer etc ... 2.1 Piano home theater system speaker ,With usb ,sd ,vfd display, fm , karaoke , mini remote function