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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
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SLXD14/SM35 - Wireless System with SLXD1 Bodypack Transmitter and SM35 Headset Microphone - Shure USA
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