The micro USB pinouts for micro USB devices, which are often referred to as USB 2 the USB 3 and USB 4, have been updated.
The latest version of the USB specification, released by the USB Implementers Forum (USBIF), allows the use of a single micro USB 2 pin for both devices.
A single micro SD card has a single pin for USB 3, but can be configured to support either USB 3 or USB 4.
A micro USB 4 is compatible with USB 3.
A USB-C adapter can be used with the micro USB to charge the device.
The USB-TEST specification is the next update in the USB-IF standard, which provides the interface for devices to communicate with each other and with peripherals like cameras and printers.