1.2.1 ch home theater 2.RMS:30W+10W*2 3.Speaker unit:4"+3"*2 4.Electroplating Knob 5.Support usb ,sd card ,vfd display ... . Volume, bass, treble, echo, mic-volume separately control4. Compatible with PC/VCD/DVD/CD/TUNER/TAPE/TV and other audio input ... *340*329MMCarton: 692*370*675mm/4sets Quantity:1550sets/40HQ 2.1 Piano home theater system speaker ,With usb ,sd ,vfd display, fm , karaoke , mini ...