These are the Technics AZ100 high-quality wireless earphones. I purchased them on Mercari, where they were listed as having only been used a few times, and I myself have used them twice. There are no visible scratches. They are the twist-to-fit, in-ear canal type, and the moment I put them in, I was able to enjoy the amazing noise canceling and powerful bass, as well as the crisp sound, just as I had heard. I even thought, "IRIS OUT sounds like garbage!" compared to the earphones I had been using from Yamaoka-san. However, either my ears are not a good fit, or when they are in a secure position, only one ear starts to hurt, so I'm letting them go. I hope they will be able to thrive for a long time with someone whose ears are well-suited (symmetrical) for them.