The adapter will convert your iPhone 3G or iPhone built-in headset jack into a 3.5mm (female) headphone jack to allow you to use any standard 3.5mm headphone of your choice.
This hands free mechanism allows you to listen to MP3's, to be alerted of incoming calls, to answer and hang up calls with a one-touch button, and to adjust the loudness of music or calls with the aid of the built-in volume control.
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