TEENAGE ENGINEERING OP-1 Portable Synthesizer Purchased and used only a few times to test the sound. After that, it was stored in a case and rarely used. Power-on and operational check confirmed, with no issues. Never taken outdoors. Smoke-free and pet-free environment. No noticeable scratches or stains, and I believe it's in overall very clean condition. (※Please check the photos for the condition, as this is just my personal assessment.) Operation confirmed, with no problems with the keys, knobs, buttons, and terminals.