Purchased in Oslo, Norway in August of this year. I was drawn to the design and bought it, but I haven't had many opportunities to use it, so I'm putting it up for sale. Total usage time is about 2 hours. There is no box, but all accessories are included. □ 3.5mm adapter □ Cable: 6.3mm stereo standard plug (unbalanced) □ Cable: 4.4mm plug (balanced) □ Genuine pouch I will also include a stand as a bonus. If you have any questions, please feel free to comment. Product Description Sennheiser's high-end headphones, which lead the world's audio scene beyond the times with their well-balanced and natural reproduction. Features of the HD 660S2: Delicate sound reproduction Rich low-frequency expression Perfectly balances conflicting technical requirements From familiar songs you've listened to for years to songs you're hearing for the first time, it offers a unique and dramatic sound experience. Manufacturer's official website: https://jp.sennheiser-hearing.com/products/hd-660s2