Shure BLX14SM31-J10 Headworn Wireless System with SM31 Headset Microphone

The Shure BLX14/SM31 is a complete wireless headworn microphone system pairing the BLX wireless platform with the SM31FH high-performance fitness headset microphone — the system most fitness instructors, presenters, and high-energy speakers reach for when they need a wireless mic that survives sweat and stays in place.

What's in the box:

• BLX4 single-channel receiver (1/2-rack)
• BLX1 bodypack transmitter
• SM31FH headset microphone with TA4F connector
• Power supply
• 2x AA batteries for transmitter (~14 hours runtime)

Why SM31FH for fitness: Standard headset mics fail in fitness environments because sweat shorts the capsule and they slip out of place during high-intensity movement. The SM31FH uses a hydrophobic woven fabric over the capsule to wick moisture away, with a secure dual ear-loop design that locks the mic in place even during jumping, rolling, or floor work. Cardioid pattern rejects sound from behind — important when the speaker is in front of a loud sound system.

Specifications:

• System: BLX wireless on J10 band
• Operating range: ~100m line of sight
• Battery life: ~14 hours on 2x AA
• Frequency-agile (16+ compatible channels per band)
• Quickscan one-touch channel selection
• Up to 12 systems on a single J10 band

Ideal for: Fitness studios, spin instructors, yoga teachers, dance instructors, presenters who move while speaking, school teachers, tour guides, and houses of worship with active worship leaders.