Roland EDIROL PC-50 MIDI keyboard controller. Power-on tested. Operates on 4 AA batteries. AC adapter sold separately. Can also be used via USB connection. The original box has stains and tears. [Product Contents] ・Main unit, USB cable, CD-ROM, Instruction manual ・MIDI/USB connection compatible *Please note that a MIDI keyboard is used in conjunction with a computer's instrument sound source (VSTi), etc., and will not produce sound on its own.