This is an earphone for versions (3.2.1, 3.3.1). It can be paired with 3.2.1 and 3.3.1. Sony WF-1000XM5 Black Earphone Right side (R) only *Operation confirmed *Pairing confirmed Please purchase with confidence as the above has been confirmed. You can also purchase immediately without comments. If you have lost one earbud or want to revive your earphones, please consider this. Battery operation has been confirmed for more than 1 hour. Battery life has not been confirmed. Please note that the battery is a consumable item and is not covered by warranty. Please be sure to check the product condition in the photos. We will assume that you have agreed to the condition after purchase. As this is a used item, there may be small scratches or stains that cannot be removed. Please understand that this is a used item before considering purchasing. ◆◆Important points◆◆ This is an earphone for versions (3.2.1, 3.3.1). It can be paired with 3.2.1 and 3.3.1. Please note that it cannot be paired with other versions. Please be sure to check the version of your single earbud before purchasing. If you don't know how to check the version, we will tell you how to check it. (Please note that this is different from the app version) *When pairing with 3.2.1, the app will not connect directly on iOS devices. You can connect to the app on iOS devices after connecting to the app on an Android device, updating, and unifying to the latest version. ◆◆Pairing◆◆ According to the official SONY, it is not possible to purchase a single earbud separately and pair it, but it is possible only if the above version conditions are met. Pairing requires reset + initialization (see the official page for instructions) If you don't understand, please feel free to ask. You can also pair different colors. Please note that we do not accept returns due to pairing issues caused by version differences after the product arrives. Search terms #WH-1000XM