Hey, Im selling this midi contoller because i recently upgraded to the pro88 keyboard from m-audio. The radium is a good little keyboard that has alot of knobs and sliders. It has a midi interface too. Its powered by the USB cable. I never had any problems with it. The condition is good but there are a few scratches and scuff marks. It sold for 150 when it first came out but im willing to part with it for 50 bucks. Its just sitting in my room taking up space. Message me if you want it!