Yamaha PSR-550 in perfect working order in every respect. The only flaw is that one key is missing: the E key in the first octave. There are some signs of wear and a few small scratches on the display (but it’s perfectly visible). Otherwise, the keyboard works perfectly—I’m selling it as “damaged,” but it actually works perfectly. Once you’ve seen and approved it, I won’t accept any returns. I’m selling it without the power adapter: you can find one online for 10 euros....