The 3.5mm stereo audio adapter with microphone is a great item. Via this adapter you can use any other earphone in your Iphone to answer calls. It is also a good extension cable to use with the earphone which has short audio cable. This adapter is a great one with microphone. Via it you can listen music and answer phone call with a normal earphone. - Color: Black - Standard 3.5mm audio socket connects your favorite earphones - Answer calls and Handsfree talk - High quality built-in microphone with good sensitivity for recording and talk - Shirt clip allows you to hold the microphone close for good reception - Compatible with Iphone 3g/3GS/4 - Cable length: 70cm