The Federalist Papers (correctly known as The
Federalist) are a series of 85 articles advocating the ratification of
the United States Constitution. Seventy-seven of the essays were
published serially in The Independent Journal and The New York Packet
between October 1787 and August 1788 . A compilation of these and eight
others, called The Federalist, was published in 1788 by J. and A.
MLean.
The Federalist Papers serve as a primary source for interpretation of
the Constitution, as they outline the philosophy and motivation of the
proposed system of government.The authors of the Federalist Papers
wanted to both influence the vote in favor of ratification and shape
future interpretations of the Constitution. According to historian
Richard Morris, they are an incomparable exposition of the
Constitution, a classic in political science unsurpassed in both
breadth and depth by the product of any later American writer.
(Summary by Wikipedia)
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The ZyngRule audiobook reader has the following features:

* Table of Contents
* Pocket Guard Screen Lock: a translucent overlay prevents accidental button presses while your iphone is placed in your pocket
* 6 bookmarks
* 10-second rewind and fast-forward
* Sound effects