Amazon.com: Audio Replacement Cable with in-Line Mic Remote Volume Control Compatible with B&O Play by Bang & Olufsen Beoplay H6, H7, H8, H9, H2 Headphones and Compatible with iPhone iPod iPad Apple
Geekria QuickFit Audio Cable with Mic Compatible with Bang & Olufsen B
Xaudia Microphone Blog: Upgrades for B&O microphones.