Shure BLX14/SM31-H9 Wireless Fitness Headset Microphone

The Shure BLX14/SM31-H9 is a wireless microphone system engineered specifically for fitness and active performance environments. At its core is the SM31FH fitness headset condenser microphone — a lightweight, moisture-resistant headset designed to stay secure and deliver clear vocal pickup during high-energy group exercise classes. The headset connects to the BLX1 bodypack transmitter, which clips to a waistband or belt and provides up to 14 hours of operation from two AA batteries, comfortably covering even the busiest instruction schedules without a battery change.

The system's BLX4 single-channel receiver completes the wireless link with a usable range of up to 300 feet, giving instructors the freedom to move throughout a studio, gym floor, or stage without signal dropouts. Setup is intentionally straightforward — Shure designed the BLX line for quick deployment with minimal technical fuss. For facilities with multiple instructors, up to 12 BLX systems can operate simultaneously within the same frequency band. The H9 frequency designation refers to a specific operating band, and Shure recommends verifying regional availability before purchase. A two-year warranty and a complete accessory set — including windscreen, clothing clip, and belt clip — round out a system built for daily professional use in demanding physical environments.