This is an authentic product purchased from e-earphone around June of this year. I've used it a few times, but on-ear headphones don't really suit me, so I'm selling them. It's in excellent condition as I haven't used it much. Also, I purchased a 5-year extended warranty for an additional 2000 yen, so I will include the warranty and the invoice. I hope you will consider this, taking into account that it is a genuine product and includes a warranty!