Let me try again, 'cause the replies are looking rather off-the-mark.
The newer Ring solar panels (that power the newer spotlight cams and stick-up cam have a cord that you plug into the camera device to keep the camera devide’s battery charged. The PLUG at the end of that cord is a small barrel-type plug. Barrel plugs are specified by the outer diameter of the metal part of the plug and the inner diameter of the ‘hole’ in the center/end of the plug. Q: What are those two diameters sizes, in mm?