SM31FH on August 18, 2015 | Marketing Team Fitness Headset Condenser Microphone Cardioid condenser headset microphone for wireless systems features hydrophobic construction that repels moisture. For use in fitness instruction. Headset microphone for wireless systems used in fitness instruction Condenser cartridge with moisture-repellent housing that resists corrosion Cardioid polar pattern Available in bundled BLX and GLX-D® wireless systems, and works with all Shure wireless headset systems featuring TA4F (TQG) connectors