1) 2.1 sound system with USB, SD, Karaoke, screen 2) high cost performance and excellent sound effect USB sound system Output(RMS): 50W+15W ... 'G/40'H: 475/950/11142.1 sound system with good design and Karaoke, screen, USB, SD card reader, fashionable and good ... sound effect USB sound system USB 2.1 sound system