Shure BLX14/SM31 Wireless Cardioid Fitness Headset Microphone System

The Shure BLX14/SM31-J11 is a wireless headset microphone system designed for instructors, presenters, and performers who need clear sound along with total freedom of movement. It combines proven Shure audio quality with a setup process that takes only moments, so you can walk into a room, power up, and start speaking or teaching without technical delays.

Inside the box you will find the BLX4 single channel receiver, the BLX1 bodypack transmitter, and the SM31FH headset microphone. The receiver sits neatly on a desktop or equipment rack and uses hidden internal antennas to keep your stage or studio tidy. The bodypack clips to a belt or waistband and runs on two standard AA batteries. The SM31FH headset features a cardioid pickup pattern that captures your voice while helping to reject loud music, crowd noise, and echo in lively fitness studios. A moisture-repellent construction protects the mic element from sweat during high-energy classes.

Once powered on, the QuickScan feature searches the available spectrum and locks in the clearest frequency, so you do not have to scroll through channels or worry about interference. With a line-of-sight range of up to 300 feet, you can roam the entire stage, move through a large classroom, or instruct an outdoor boot camp while maintaining a steady signal. A fresh pair of AA batteries delivers up to 14 hours of runtime, enough to cover multiple sessions or long presentations without swapping cells mid-event.

Fitness professionals will appreciate how the lightweight headset stays secure during jumps, spins, and floor work. Corporate presenters can rely on the same system for all-day conferences, training seminars, or trade-show demos. Houses of worship, dance studios, and rental companies will find it equally practical because the components are rugged, straightforward to operate, and compatible with other Shure BLX products already in inventory.

• Wireless operating range up to 300 feet lets you move freely in large rooms or outdoor venues
• Up to 14 hours of continuous use from two AA batteries keeps classes and events running smoothly
• SM31FH headset resists moisture and stays comfortable during intensive workout sessions
• QuickScan automatically selects the clearest available frequency to avoid dropouts
• BLX4 receiver uses internal antennas for a clean setup with minimal cabling
• Cardioid polar pattern helps reduce background noise and feedback