The Remote ID requirement is scheduled to take effect in the United States in September 2023. I purchased two Beacon modules from Dronetag to provide add-on Remote ID capability on my older drones. They are small and light, and can be easily moved from one aircraft to another.
For more information on Remote ID, see the FAA Remote ID info page. To see which devices are currently compliant, see the FAA compliance list.
I am just starting to field test these devices and I will be posting my findings on this page.