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Remove reference to button and replace it with thumb with a description as to what it is.
useful links https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/Controls.html#//apple_ref/doc/uid/TP40006556-CH15-SW1 http://www.w3.org/html/wg/drafts/html/master/forms.html#range-state-(type=range)
also see http://www.oracle.com/webfolder/ux/mobile/component/slider.html