The eartec 609 range of headsets are designed to work in the toughest environments. The 609 & 609D boast a greater noise-cancelling technology so your voice comes through clear despite workplace volume. All monaural designed headsets offer a cool and comfortable fit; as a pro headset, it is more robust and has a larger headband. The fixed microphone boom adjusts freely to any position, and is longer than non-pro headsets.