Purchased in 2023. Sound output has been confirmed. Used for a few days. The sound quality is excellent, but it doesn't fit my head, so I'm selling it. I used it with a headband cover and ear pad covers, so I don't think there's any dirt. An unused headband cover is included. Accessories include the main unit, case, instruction manual, mini-plug adapter, and headband cover. Please consider purchasing if you understand that this is a used item and after confirming the photos.