Thank you for viewing. This is a Sony WF-1000XM4 wireless earphone in black. I purchased it new in 2023 and used it occasionally for about 15-30 minutes at a time. I am selling it because I switched to an open-ear type. Startup has been confirmed. I used the M size ear tips, and I also have the replacement S and L sizes. They have been disinfected, but if you are concerned, please replace them after the product arrives. Thank you.