This is the YAMAHA HPH-MT8, a closed-back studio monitor headphone. It's a highly-rated product, praised for its excellent balance and high resolution. Please see below for more details. You can also download the manual. https://jp.yamaha.com/products/proaudio/headphones/hph-mt8/index.html There is some wear and tear, including minor scratches, but there are no significant scratches or damage. It was used only indoors. I think the ear pads have started to deteriorate due to aging. There is no noticeable damage at the moment, but the surface of the ear pads feels a little sticky. This kind of deterioration is unavoidable with products that use synthetic leather, so I recommend replacing them with genuine YAMAHA replacement ear pads or compatible third-party ear pads when the deterioration becomes severe. Also, although there is no severe deterioration at the moment, the headband is also made of synthetic leather, so it will deteriorate over time. As a bonus, I'm including an unused polyurethane headband cover. If the surface of the headband cracks or peels, you can use this headband cover to avoid worrying about deterioration. (The "YAMAHA" lettering on the headband will no longer be visible.) There are no operational problems. In addition to the main unit, the following accessories are included: a 6.3mm stereo standard plug adapter, a 3m straight cable (detachable), a 1.2m coiled cable (detachable), a carrying pouch, and a polyurethane headband cover. The two cables are unused or almost unused.