USB Type-A To Micro-USB

The USB-A cable’s other end is made up of a Micro-USB A or Micro-USB B connector and thus can accept either connection. This cable is designed exclusively for USB On-The-Go devices. These connectors are identified by their distinct gray-colored receptacle and compact 5-pin design. You won’t find this on any cable, as it only exists as a receptacle for On-The-Go devices

The items that can commonly use this cable are Bluetooth speakers, e-reader devices, small gadgets like reading lights, and so on

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Source: https://www sfcable com/blog/understanding-usb-a-and-micro-usb-connectors