just came back from seeing "book of eli"... denzel washington has been roaming an apocalyptic wasteland for 30 years. his main concerns are protecting his book, finding water, and charging his battery that powers an ipod - which is listens to through a pair of Beat Tours. so if the movie is to be believed, the Tours are durable.
(in case anyone cares, the movie gets a mild thumbs up... entertaining, better than daybreakers as far a apocalyptic sci-fi goes)