When using earplug headphones (I use the Etymotic ER6-i), it is very difficult to hear exterior sounds, particularly voices. It would be nice if there were an option to turn on an exterior microphone that feeds to the headphones so you didn't have to remove the helmet when talking to people when stopped, i.e. gas stations, parking lots, etc. BTW, I love this unit.
External microphone for earplug headphone use.