The cable has CONTROL TALK FEATURES.
Play, Stop, Step Back One Track - 3 clicks, Next Track - 2 clicks
Built-in mic and answer/end button for easy and clear hands-free calling on iPhone and many music phones.
ControlTalk features a built-in mic and answer/end control button that lets you take incoming calls on your iPhone and most music phones with a 3.5 mm headphone port. It even automatically switches off any music that was playing.