Card reader. Definitely a card reader. Only time I ever hook the Sony to computer is for updating or tethering. File transfers are always via a reader but make certain you get one that allows WRITE access to file names. A Vivitar one I have won't let you alter the name or individually delete from card whereas a writeable version will. (You'll need to trash it then EMPTY the trash or else it still remains on the card. If you don't empty trash the next time card is inserted you'll discover it still in the trash.) The 'Yes' version comes in different manufacturer packaging but the guts are ALL identical. The $30 version is the same as the $7 one. I shoot to 128 & 256 GB cards and connecting the Sony having a full card would take forever.