I purchased this used 7-8 years ago, but I'm selling it because I don't use it anymore. I've only used it a few times at home, so it's in good condition. I've confirmed that it works. It can be powered by batteries or AC adapter, but the adapter is not included. Please use a commercially available one. - Model Name: BOSS ME-50B - Effect Type: Multi-effects - Control Knobs: Filter/Tone, Drive/Synth, Delay/Modulation - Included Accessories: Case, Instruction Manual - Features: Versatile sounds using COSM technology Thank you for looking.