The CoreParts MBXUSBC-CO0009 is a power cable adapter for connecting a USB-C female socket to a device with a 7.4 x 5 mm plug. Its two connector ends let it bridge these different connection types in a compatible charging setup.
The USB-C end is female and straight, while the 7.4 x 5 mm end is male and angled. This layout keeps the larger plug turned to the side when connected. The cable is black and is listed as a single piece per package.