The $350 device slips over your eyes like a pair of glasses and blocks distractions while reading. It also has a remote which makes it easier to flip the pages and to set the focus so you don't need to wear your specs.
A full battery gets you around 25 hours of reading which should be enough for most people. Even an avid book reader getting into a good book like this one is going to read it for 24 hours straight.
The displays are 1.3-inch, e-ink displays with 256x256 per-eye resolution. The glasses have 64MB of storage, which should hold plenty of ebooks. They look a bit like sun-glasses so if you are on holiday by a pool you don't have to worry about people from Florida asking you "what you are reading for?"