belanaEtcher not recognizing my USB

I’ve downloaded balenaEtcher on both my Mac and PC. Getting set up and downloading the image I wanted to flash was very easy on both. But also on both, balenaEtcher is not recognizing my USB. I purchased a brand new microSD card reader:

and a 4GB sd card both SanDisk and plug into my USB port. I can see on the PC that the SanDisk is there, but I can’t select it on balenaEtcher.