Official Raspberry Pi Micro-USB-B To USB-C Adapter In Black

Part number: USB-Micro B to USB-C Adapter Black
Description
Micro USB-B to USB-C Adapter allows you to connect to your Raspberry Pi 4 via the new USB-C power port using your Standard Micro-USB charging cable. Simply plug a Standard Micro-USB cable into the female connector of this adapter, then plug the male connector of the adapter into your USB-C device port. Remember, the Raspberry Pi 4 Model B requires a 5.1V/3A power supply. This Adapter is also available in White (1882074)
Details
Power Supported: up to 5V/2.4A/12W