https://helpguide.sony.net/mdr/h ... ts/01/04/01/01.html
Charging the headphones
Connect the headphones and the booted computer using the micro-USB cable supplied.
Use the micro-USB cable supplied for charging the headphones only. (You may not be able to charge the headphones with other cables.)
A computer with a USB jack or a USB Charging AC Power Adaptor AC-UD11 (sold separately) is required to charge the headphones.
The charge indicator is lit in red during charging.
It goes off when charging is completed.
When the charge indicator goes off, disconnect the micro-USB cable.