The gn210039s advanced sound system with unc microphone makes it the perfect headset solution even in noisy telephone intensive environments with three interchangeable wearing styles for maximum user comfort the gn2100 is user friendly and ideally suited to prolonged periods of use the attractive and unique three in one design takes personal comfort to a new level allowing you to choose most comfortable wearing style either a headband surefit earhook or adjustable flexloop as top for