... uses in stage, shop and disco, KTV 2) high output pro loudspeaker with USB, SD card, remote control, Karaoke Output(RMS ... )20'G/40'G/40'H: 162/324/3802.0 pro speaker uses in stage, shop, disco, KTVHigh-power; euphonious alt ... USB, SD card, remote control, Karaoke functions USB 2.0 pro loudspeaker