The USB interface supports SD card but need SD card reader, please prepare by yourself. Features Multiple signal inputs makes enjoying the fun of karaoke freely, with USB (PC-USB/U-disk/SD Card) / Bluetooth / Microphone / stereo L/R RCA / FM Radio / Video RCA inputs, two microphones inputs to achieve the function that friends or lovers to sing together. With separate reverberation effect and tone adjustment, independent control of MIC1, MIC2, Music and MP3, can meet all your needs, let you have a perfect performance. Support functions of U-disk playing MP3 and recording, audio broadcasting, BT playing. With control panel, including knobs of previous music, pause, function switch, next music. With LED display, clearly to show the working status. Can be powered by 5V power bank (not included) or power adapter (universal voltage 110-240V) directly. DC 5V input supports home / car / outdoor use, very convenient and easy to have a perfect party. Stable, lightweight, small and elegant, suitable for stage, families and KTV rooms, enjoy singing and have fun with it. Parameters Signal input: USB (PC-USB/U-disk/SD Card) / Bluetooth / Microphone / stereo L/R RCA / FM Radio / Video RCA Signal output: stereo L/R RCA / Video RCA Number of channels: 3 Power Supply: Input: 110-240V, 50/60Hz; Output: 5V/2A Working voltage: DC 5V Dimensions(W*D*H): 140*146*45mm Net weight: 298g / 10.51oz Package weight: 600g / 21.16oz Packing List: 1*Sound Mixer 1*USB Cable 1*Power Adapter(equipped with optional US/EU/UK/AU plug) 1*AV RCA Cable 1*RCA to 3.5mm Audio Cable 1*3.5mm Adapter