In practice, the case isn't much different in dimensions to a standard protective iPhone case, if a little chunkier along the base. The whole thing locks in to the iPhone 4's connector. although there's still another port to charge through there. The case also has integrated apps attuned for the blind, with Braille entry possible using all those multiple touchpanels.
Check out the video below to see how it works. The case is said to launch this summer for between $59 and $99.