Patazon Black Extension Dock Extender 30pin Adapter for iPod iPhone 4 4S
I just tried it on my iphone 4s with Lifeproof case and it interferes with case charging port access cover.  You can 'force' the extension in but over time it would wear out or break off the hinged cover.  &#34;So that's why Lifeproof sells their own extension for 4x the price of the Patuoxun&#34; lol