Buffalo 4-Bay & 2-Bay RAID NAS Device

The title seems to indicate that you are getting 2 devices, but the specs only list the 4-bay. What’s the deal?

Does this product include the HDD’s? For the price, I would imagine so, but the description doesn’t say.

Also, what exactly is missing from the box? I don’t mind supplying my own ethernet cable, but if the power adapter isn’t there that would be a problem.