This listing is not for a Raspberry Pi4, but a service which requires the buyer to ship their Raspberry Pi4 to be modded and shipped back.  

There are plenty of gaming and operating systems that work on a Raspberry Pi4, but the majority of Raspberry Pi4 owners don't even know they can run many operating systems off of a SATA drive that can be connected to a USB port.  The buyer would be responsible for having the proper adapters for their system as nothing is provided as part of this listing except the modding service.

Raspbery Pi's can be made to support bootable USB media like flash drives, hard drives and SSD drives, but the functionality has to be enabled by modifying the firmware on the Raspberry Pi4.  The benefits of being able to boot from USB media is that 
  • you can use media that is actually created for the task unlike a micro SD card.
  • USB connected SATA media will be better suited for read/write as expected from any operating system.
  • SATA drives will be more reliable than a micro SD
  • Larger SATA disks are usually less expensive than similar sized micro SD's.
The Raspberry Pi4 will need to be shipped to me to do the modifications as it can't be done remotely. 
The changes to the firmware will be made and then it will be tested before packaging up to return to the buyer.

After the purchase, you will be contacted to ensure you know what you are purchasing and to provide the address to ship to for modding. Once the modifications have been done the Pi4 will be packaged up and sent to the buyers listed address.  The turnaround time will be a few days at most.

Please contact me if you have any questions.