This is a bootable installer drive for Mac OS 10.7, 10.8, 10.9, 10.10, 10.11, 10.12, 10.13, 10.14, 10.15, 11, 12, 13, and 14 (Lion all the way through to Sonoma)
The size of the USB drive is 256gb and comes with both a USB Type-C end and a USB Type-A End
Can be used to upgrade older system to any OS from Lion up to Sonoma (as long as it is officially supported by Apple)