VocoPro JamCube Mini PA System Four 1/4" microphone/instrument inputs for maximum diversity Built-in Multi-Format Player & USB Port/SD Card Reader Supports DVD, CD, CD+G, Mp3 & Photo CD Formats Digital Key Control for changing the key of any disc & USB Port/SD card played in the multi-format player If you prefer to tote your media on a portable storage device, the onboard USB port and SD card slot can access your files