Sony WF-1000XM4 Wireless Noise Cancelling Earbud Left Ear Only (L) (New Battery)
Sony WF-1000XM4 Wireless Noise Cancelling Earbud - Left Side Only (L) – New Battery Installed. Add a note at checkout saying which software version your other earbud is on (v1 or v2). Current software version is shown in the app.