"The SM31FH cardioid condenser microphone with analogue transmission, designed for use in fitness instruction, features moisture-repelling construction for true performance in humid applications where corrosion damage is common.
 
 Shure BLX Wireless Systems combine professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, it's the most accessible way to own the stage.
 
 Includes BLX4 wireless receiver, BLX1 bodypack transmitter, SM31 fitness headset microphone, power supply, clothing clip, windscreens, and user guide.
 
 
 - BLX1 Bodypack Transmitter -
 Analog wireless bodypack BLX1 for use as part of BLX and BLX-R Analog Wireless Systems.
 
 The durable BLX1 features a lightweight, ergonomic design and adjustable gain control. For use with BLX Wireless Systems.
 
 
 - BLX4 Single-Channel Wireless Receiver -
 Analog wireless receiver provides improved linearity and frequency response with group and channel scan for easy set-up. Features include microprocessor internal antenna diversity, frequency QuickScan, and two-color audio status indicator LED.
 
 The durable BLX4 features simple setup, intuitive controls, and microprocessor-controlled internal antenna diversity. One-touch QuickScan frequency selection quickly locates the best open frequency in case of interference. For use with BLX Wireless Systems.
 
 
 - SM31FH Fitness Headset Condenser Microphone -
 Cardioid fitness headset condenser microphone offers a moisture-repelling hydrophobic construction for use in fitness training, Features include windscreen and compatibility with Shure bodypack systems for replacement of TA4F-connected microphones.
 
 The rugged and durable SM31FH is a cardioid condenser microphone constructed with hydrophobic materials that make it ideal for true performance in fitness instruction applications.
 
 The moisture-repellent cartridge housing ensures a long product life by protecting the microphone from the corrosion damage that causes typical fitness instruction headsets to fail.
 
 Available in bundled BLX and GLX-D wireless systems, the SM31FH features TA4F 4-pin (TQG) connectors that make it a viable replacement for any Shure wireless headset system."