Our HM100 headset mic is tough and reliable. The HM150 is TOUGHER. We took the HM100 headset wire form and beefed up the microphone component. A more robust boom, shortened and fattened, anticipating more aggressive speech and physical activity. The noise cancelling cardioid capsule is protected by a unique sweat guard. We've added a 25mm windscreen to control wind noise outdoors and an adjustable neoprene head band to comfortably secure the headset for physically agressive users such as aerobics instructors and coaches.