Shure SM31FH Wireless Fitness Headset Condenser Microphone Wireframe headset fits securely and comfortably for fitness and aerobics instructors Moisture-repellent hydrophobic fabric protects the microphone cartridge from harmful corrosion that occurs in humid environments Flexible gooseneck provides discrete adjustment capabilities to optimize placement for greatest isolation Lightweight and low-profile design wont fatigue instructors during high-impact use TA4F (TQG) connector is compatible with any Shure wireless body pack. Place the microphone at the corner of the mouth. To decrease pops and plosives, avoid placing the micro-phone directly in front of the mouth