The SHURE's SM31-FH is a wireless microphone features moisture-repellent build for true performance in humid environments where corrosion is widespread. It is a tough and durable cardioid condenser microphone, the SM31-FH ftness headset adds hydrophobic materials to the industry-standard, road-tested Shure SM family. The moisture-resistant cartridge housing safeguards the microphone and provides a long service life. SM31-FH also available with SM Analog Wireless and SM Digital Wireless system bundles, and has TA4F 4-pin connectors, making it a viable replacement for any existing Shure wireless headset system.