Shure
Shure BLX14/SM31-H9 Wireless Fitness Headset Microphone
★★★★★
condenser
The Shure BLX14/SM31 wireless system pairs a sweat-resistant fitness headset mic with reliable 300-foot range for group exercise instruction.
$429.00*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.
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Overview
Key Features
H9 (512–542 MHz) UHF FREQUENCY BAND: Operates on the H9 (512–542 MHz) UHF frequency band for dependable wireless audio transmission in regions where this spectrum is authorized. Verify local compliance before ordering.
PROFESSIONAL RANGE & ALL-DAY POWER: Provides reliable audio transmission up to approximately 300 ft (100 m) line-of-sight. The BLX1 bodypack transmitter operates up to 14 hours using two AA batteries under typical conditions.
COMPLETE FITNESS AUDIO SETUP: Includes BLX4 single-channel receiver, BLX1 bodypack transmitter, and SM31FH fitness headset mic with clothing clip and windscreen. Also includes power supply, 2 AA batteries, and user guide.
IDEAL FOR FITNESS & ACTIVE PRESENTERS: The SM31FH headworn mic features a secure fit and moisture-resistant construction designed for aerobics instructors, trainers, and high-movement environments.
SHURE ENGINEERED RELIABILITY: Built with Shure’s trusted UHF wireless design and simple setup, supporting up to 12 compatible systems per band for reliable performance in multi-device setups.
Specifications
Microphone
SM31FH Fitness Headset Condenser
Receiver
BLX4 Single-Channel
Transmitter
BLX1 Wireless Bodypack
Wireless Range
Up to 300 feet (100m)
Battery Life
Up to 14 hours (2x AA)
Frequency Band
H9
Max Simultaneous Channels
12 per frequency band
Warranty
2 years
Pros & Cons
👍 Pros
- SM31FH headset is purpose-built for fitness with sweat and moisture resistance
- 300-foot wireless range allows instructors to move freely across large studios and gym floors
- 14-hour battery life from standard AA batteries easily covers a full day of classes
- Quick setup with minimal controls gets the system running without technical expertise
- Up to 12 channels per band supports multi-instructor facilities
👎 Cons
- Single-channel receiver means each system supports only one microphone at a time
- H9 frequency band may not be available in all regions — must verify before purchasing
- AA batteries add ongoing replacement cost compared to rechargeable transmitter designs
- Audio quality, while professional-grade, is optimized for speech rather than musical performance
Frequently Asked Questions
How long does the battery last in the BLX1 bodypack transmitter?
The BLX1 transmitter provides up to 14 hours of continuous use from two standard AA batteries.
What frequency band does the H9 model operate on?
The H9 designation indicates a specific wireless frequency band. Before purchasing, verify that the H9 band is authorized and available for use in your geographic area using Shure's Wireless Frequency Finder tool on their website.
Is the SM31FH headset microphone resistant to sweat and moisture?
Yes. The SM31FH is specifically designed for fitness applications with moisture-resistant construction to withstand sweat during high-intensity classes.
How many BLX systems can operate simultaneously in the same venue?
You can run up to 12 compatible channels per frequency band, allowing multiple instructors or presenters to use wireless systems simultaneously in the same space.
What is included in the BLX14/SM31-H9 box?
The system includes the BLX4 single-channel receiver with power supply, BLX1 wireless bodypack transmitter with belt clip, SM31FH fitness headset condenser microphone, clothing clip, windscreen, two AA batteries, and a user guide.
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