Shure SM31FH Fitness Headset Microphone for Shure Wireless | Sweetwater
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SM31FH - Fitness Headset Condenser Microphone - Shure USA
Amazon.com: Shure BLX14/SM31 UHF Wireless Microphone System - Perfect for Fitness, Aerobics - 14-Hour Battery Life, 300 ft Range | Includes SM31FH Fitness Headset Mic, Single Channel Receiver | H9 Band : Musical Instruments