SONY WF-1000XM5 BLACK Left Earbud Sony Wireless Earbuds Noise Canceling This is the version (3.3.1) earbud. 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 other earbud before purchasing. If you don't know how to check the version, please ask and I will tell you how to check it. *When pairing with 3.2.1, the app will not connect as is only on iOS devices. After connecting to the app with an Android device and updating to unify the version to 3.3.1, it will be possible to connect to the app with iOS devices as well. Operation confirmed Color: Black Listing for the left ear only Will be wrapped in bubble wrap and shipped via Mercari delivery. Other features... Noise canceling