Charging cable for PlayStation Bluetooth headset

[inlayterms]

Hi, folks. Long time, and I hope all are well.

I have this old Sony Bluetooth headset; it worked fine up until a couple of weeks ago, although it's had difficulty charging for a while now, but has stopped charging altogether.

I don't know if the headset itself has given up the ghost, or if the charging cable is shot. I'm hoping it's the charging cable, so I would like to buy one and see if that's the problem. But, I don't know which of the myriad of charging cables to buy, so I'm hoping one of you would be able to link to the one that I need. I'm attaching a photo of the headset for reference.

Thanks.