... digital karaoke,with VFD display Specifications: With usb,sd card read function, play mp3 type music,can add wma type music ... plastic pannel.Compact with PC, VCD, DVD, IPOD, MP3/4, directly and suitable to all the device of ... with output.Output power:30W+10W*2(RMS)Speaker driver:woofer4inch,satellite3inch*2 Frequency Response 55Hz-20KHzImpedance4Ω ... .alibaba.com D-109 2.1 ch USB/SD multimedia speaker