SONY's flagship model. A legendary model, also called the completed form of wireless earphones. The balance of low, mid, and high frequencies is good, so you can enjoy it regardless of genre. These are excellent earphones that are still going strong! No noticeable scratches or dirt. The left and right earphone batteries were replaced with new Z55H batteries on 2025/6/22. Case battery is good (not replaced). Other than that, operation has been confirmed and you can use them comfortably. Will be initialized before shipping.