It's the classic problem. You get your iPhone home keen to use it's great music functionality only to discover the you're stuck with the awful Apple earbuds. The Headphone jack is recessed into the body so that the vast majority of aftermarket headphones will not fit. The iPhone headphone adaptor allows you to connect third party headphones to your iPhone. All standard Apple headphones will fit your iPhone but if you wish to replace them with another make the recessed 3.5mm jack means that not all headphones will fit - this adaptor allows any headphones to fit your iPhone perfectly! NB: This product has no microphone so cannot be used as a handsfree kit.