SONY WF-1000XM4 Black Used for about 3 years. The ear tips are from another company, so they are new and unused. A silicone case is also included. This model has a more pleasing bass than the WF-1000XM5. The deep bass matches various songs, and it's not just about noise cancellation! (lol) Although the battery has degraded somewhat, it's recommended for those who want to try the SONY WF-1000X series. Price is negotiable. I will try my best to accommodate your requests. Also listed on other flea market sites. Please take a look.