※ If there are no issues with the product or the listed details, and you understand, you can purchase immediately without any problems. Thank you for viewing. This is a SONY wireless earphone WF-1000XM4. This product is a junk item. Please review the details before considering a purchase. We cannot provide support after purchase. ※ Regarding the malfunction: After 2 years of use, noise (rumbling sound) occurs during noise cancellation. It has been confirmed that there are no sound problems when noise cancellation is not in use. Charging and other operations are not a problem. For used items, please understand. We would appreciate it if you could check the condition of the product in the photos. All accessories are as shown in the photos. The ear tips are unused. Thank you. Sony Model Name: WF-1000XM4 Other Features: Junk