These are SONY's noise-canceling wireless earbuds, the "WF-1000XM4"! I purchased them new and have been using them. As shown in the photos, this is a set including the main unit, charging case, and unused ear tips. Both earbuds have been tested and are working, and the battery is in good condition. Charging is also not a problem. There is no yellowing or extremely noticeable dirt, and I think they are relatively clean. Since they are used items, there are some minor dirt and scratches, so please understand that. I can add more photos if needed. They have been home-cleaned with alcohol消毒. Please feel free to comment if you have any other questions!