Shure BLX14/SM31 Wireless Cardioid Fitness Headset Microphone System (H10: 542 to 572 MHz)

The Shure BLX14/SM31-H10 is a headset microphone system that uses analog UHF wireless technology and a cardioid pickup pattern to keep your voice clear while you move. Designed for the H10 band between 542 and 572 MHz, the package combines the BLX4 tabletop receiver, the lightweight BLX1 bodypack transmitter, and the SM31FH headset with a capsule that resists sweat. Everything works together to give fitness instructors, dance teachers, public speakers, and other active presenters a reliable hands-free option that does not require holding a handheld mic.

Shure provides 123 selectable frequencies, and you can run up to 12 systems in the same band at the same time, which is helpful when you manage multiple rooms or events. A maximum line-of-sight range of 300 feet lets you cover large studios, gym floors, or small stages without dropouts. Power comes from two AA batteries and lasts up to 14 hours, so a full day of classes or a long rehearsal schedule will finish before the batteries do.

Setup is simple. Use the group and channel buttons on the BLX4 receiver to scan for a clean frequency, then match the settings on the bodypack. LED indicators confirm you are locked in. The receiver’s rear panel offers XLR and 1/4-inch outputs, so you can connect directly to a mixer, powered speaker, or recording interface. Internal antennas keep the footprint neat on a desktop or equipment rack shelf.

Whether you lead high-energy cardio sessions, teach choreography, or need freedom to roam during a presentation, the BLX14/SM31-H10 provides dependable audio, quick setup, and long battery life in a compact system that is easy to pack and transport.

Highlights:

• Analog UHF system offers 123 selectable frequencies in the H10 band (542 – 572 MHz)
• Headset mic uses a cardioid pickup pattern and a moisture repellent capsule
• Runs up to 14 hours on two standard AA batteries
• Supports up to 12 systems operating simultaneously in the same frequency band
• Delivers a maximum line-of-sight range of 300 feet for large rooms or small stages
• BLX4 receiver provides balanced XLR and unbalanced 1/4-inch outputs
• Manual group and channel sync with LED status indicators simplifies setup