These speakers don't get very loud at all. I don't know why anyone would say that it has a good sound system. A real piano is much louder then these speakers output. I had to buy A PA system cause I was so unsatisfied with the sound. It has a great feel to the keys. Does not include a usb cord. I recommend spending a couple more hundred dollars for the privia px s3000. It seems to have a lot more features.