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(Image: James Kendrick/ZDNet)
Logitech Solar Keyboard Folio
The Solar Keyboard Folio has several unique features not found on most of the other keyboards in this collection. This case is a real portfolio that closes like a book. It also uses two small solar panels to keep the keyboard charged, so it requires no charging by the user. And last, but not least, it supports two different usage modes.
The solar charging keeps the keyboard charged, even in room lighting. The solar panels are on one side of the folio, so you have to make sure that these are exposed when the case is closed. Sadly, these panels are covered when being used as a keyboard, so it can't be charged while typing.
In addition to a typing position, the case supports a media viewing mode that puts the iPad at a comfortable angle for such activity. This position is also good for reading ebooks, in my experience.
Dimensions: 16.85x9.9x0.7 inches; 1 pound (without iPad).