SONY wireless earphones (Bluetooth receiver and earphone set). I am selling these as I no longer use them. Model…MDR-EX31BN Operation confirmed on 2025/11/1. (I played continuously for about 2.5 hours from a full charge, but the indicator showed the highest of the three levels of remaining battery.) There is some fading of the logo and other printing, and peeling of the plating due to aging. The receiver allows for volume adjustment, noise canceling on/off switching, and track skipping. The receiver is clip-type, so it can be conveniently attached to a collar or chest. I will also include the charging cable (USB Type B) and earphone tips of various sizes (S, M, L). * If you don't need them, please let me know and I will remove them.