WF-1000XM4 The left earbud is broken during the battery replacement. The right earbud has been confirmed to work and charge after replacement. The case sometimes blinks red. It may be related to the left earbud, but it cannot be determined. Both earbuds have new batteries. Only the right earbud is working. Connection is not possible after reset, so version confirmation is not possible. Also, only current operation has been confirmed, so please consider it as junk and no returns or refunds. All accessories are shown in the images. If you have any other questions, feel free to comment. Sony Model Name...WF-1000XM4