The USB micro-B to USB-C adapter allows you to use your Raspberry Pi 3 power supply with your Raspberry Pi 4 (Maximum power consumption must be limited to 12.5W).
Micro USB(F) to USB-C(M) Adapter
$6.05
SKU RP-SC0221
Welcome from Marcus Schappi,
Little Bird's Cofounder
Thanks for visiting PiAustralia!
I know that navigating the world of electronics and software can be challenging, but don't worry we're here to help!
If you ever need a hand, please contact me directly at help@littlebird.com.au or on Twitter at @schappi.
Thanks again and all the best,
Marcus