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 Left side (L) only *Operation confirmed *Pairing confirmed Please purchase with confidence as the above has been confirmed. You can also purchase immediately without commenting. 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. The battery's endurance time 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. Due to the product being used, there may be small scratches or stains that cannot be removed. Please understand that this is a used item and consider purchasing it. ◆◆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 existing earbud before purchasing. If you don't know how to check the version, we will tell you how to check it if you ask. (Please note that this is different from the app version) *When pairing with 3.2.1, the app will not connect as is only for iOS devices. After connecting to the app with an Android device and updating to the latest version, you will be able to connect to the app with an iOS device. ◆◆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 how to do it) 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 version differences after the product arrives. Search terms #WH-1000XM