I don't own one so can't say for certain, but I think the way the device works is, it defaults to a 2GB card, but if you want to use a larger card you just need to plug the reader into a PC (via USB) and use it's settings tool to tell it you're going to be using a larger card. That's how I think it operates, anyway. 
@Oldsmobile_Mike
Thank you for your help.
I also got a similar replied from Arnie at EAB who shared this:
You need a micro usb cable and the software.
http://www.codesrc.com/files/scsi2sd/v4.6/Connect the SCSI2SD card to the PC and use scsi2sd-util.exe to alter the settings.
The other exe monitor.exe just checks that the SCSI2SD card is connected and working.
If you feel comfortable doing it then the firmware needs upgrading to 4.6 (It may already be upgraded, but mine came with 4.4)
Well, I ran the firmware upgrade (now v4.6), and the monitor.exe routine says that everything is fine, but I can't make the adapter to save the 4GB new size configuration. It reverts to the default 2GB. See picture.
Any ideas? I'm guessing is because the actual space in this brand new 4GB is not 4GB, but 3.xGB.