inputs.text: warning not buy 2 units one made loud hissing sound messed iphone interface charging - updating review bought two units returned first unit right away made hissing sound thought second unit worked fine iphone 3gs actually important flaw second unit charges fine interferes iphone 3gs software point phone goes crazy try use charging cant even unlock phone charging phone cant pick touch commands well slide unlock bar cant make way left right absolutely impossible use apps charger plugged phone never thought charger could interfere software certainly case renders iphone useless charging charge unit fine kindof junk not total junk would not recommend anyone buy unit im 02 2 units purchased btw software engineer using charger iphone 3gs running ios 43