I purchased this product to replace a card reader which would not support an SD card I recently bough for my DSLR camera.
The reason my old card reader wouldn't support my new card is because it's capacity was too large for the old reader, annoyingly the Amazon Tech Specs did not include the card capacity limitations of the device at the time of ordering (or of typing this review) so I felt I was taking a bit of a gamble ordering it.
However it does say the limitations of the card sizes that it will read on the box it was delivered in! So here's a bit of information I have copied off of the box which Amazon should have included in the tech specs:
Card Types supported:
xD Picture Card types M, H, up to 2Gb
CF up to 137Gb
SD up to 2Gb, SDHC up to 32Gb
MMC up to 4Gb, MS up to 128Mb
MS-Pro up to 32Gb
I hope that that is of use to you!
The reader works perfectly, someone in another review mentioned that they could not get it to work on Windows XP, no such trouble here, handy having another USB port available too! delivery was quick, very happy with the device so far!