Thanks for the quick replies!
This a an 'X-drive' - Its a portable hard drive with a CF card slot.
Its used to automatically off-load contents of CF cards, like from
digital cameras, to the hard drive. Much more portable than a laptop.
The power supply charges an internal battery. I'm leaving for a trip in
the AM and want to be able to avoid buying a bunch of memory cards for
my digital camera if I don't have to. I will have a laptop as a backup
but I'm not carrying that around on my vacation, that will stay in the
hotel room. So, worst case I may need to buy another memory card and
then off-load them at the end of the day. This x-drive allows me to
off-load the pictures anytime (it fits in your pocket).