Shure BLX14/SM31 Wireless Cardioid Fitness Headset Microphone System (H11: 572 to 596 MHz)

The Shure BLX14/SM31-H11 is a wireless cardioid headset microphone system designed for active users who need reliable, clear vocal performance in dynamic environments. It operates within the H11 UHF band, covering frequencies from 572 to 596 MHz, which helps minimize interference and ensures stable wireless communication.

This system includes the SM31FH condenser headset microphone, known for its cardioid pickup pattern that focuses on the speaker’s voice while reducing background noise. The headset is built to resist moisture and stay securely in place, making it ideal for fitness instructors, presenters, or performers who move a lot and work up a sweat. Whether you’re leading a high-energy workout class or speaking on stage, this microphone keeps your voice clear and consistent.

The BLX14/SM31-H11 comes with a BLX1 bodypack transmitter and a BLX4 tabletop receiver equipped with internal antennas. It offers up to 14 hours of operation powered by two AA batteries, so you can rely on it for long sessions without interruption. The system supports a line-of-sight range of up to 300 feet, giving you freedom to move around large rooms or outdoor spaces. It also allows up to 12 systems to operate simultaneously on the same frequency band, which is useful for group events or multi-speaker setups.

With a one-touch frequency scan and access to 123 channels, setting up and finding a clear signal is straightforward. The receiver provides both XLR and 1/4 inch outputs, making it compatible with a wide range of sound systems. Overall, this wireless headset microphone system is a solid choice for anyone who needs dependable, hands-free audio in active or noisy environments.

Highlights:

• Operates in the 572 to 596 MHz UHF frequency range
• Cardioid condenser headset microphone designed for fitness and active use
• Moisture-resistant fabric on the microphone capsule for durability
• Up to 14 hours of battery life using two AA batteries
• Wireless range of up to 300 feet line-of-sight
• One-touch frequency scan with access to 123 channels
• Receiver includes XLR and 1/4 inch audio outputs
• Supports up to 12 simultaneous wireless systems per frequency band