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