Any benefit from ICON to ICON + NERD?

[borislee]

I see what Jawbone is promoting about ICON HD + The NERD. I don't understand what is different if I have my ICON without NERD connected with my PC via Bluetooth. I should have been ready to listen audio / music from my PC and able to pick up the calls from my iPhone with ICON.  Any benefit to me to have ICON + The NERD?  Please clarify.