3M Peltor WS Alert X MRX21A3WS7 Bluetooth headset earcup hearing protector, headband, SNR 31 dB

The 3M Peltor WS Alert X MRX21A3WS7 is a headband-style Bluetooth earcup hearing protector designed to reduce hazardous noise while enabling hands-free wireless communication. With a stated SNR of 31 dB, this headset combines passive attenuation with integrated Bluetooth audio for phone calls, voice prompts and media streaming. The product is intended for environments where hearing protection and mobile connectivity are required simultaneously, such as construction sites, maintenance tasks and outdoor work.

Advantages

The headset merges hearing protection and Bluetooth connectivity in a single unit, allowing users to maintain situational awareness while making or receiving calls and listening to audio. Its headband design provides a stable fit for intermittent or continuous use, and the earcup form factor offers consistent passive attenuation across frequencies. Integrated controls enable basic call and audio management without removing protective equipment, and the overall design is compatible with standard industrial safety workflows.

Suitable for

• Construction and building sites where noise levels fluctuate and communication is needed
• Manufacturing and assembly lines that require hearing protection and hands-free calls
• Outdoor maintenance, landscaping, and agricultural tasks with intermittent loud machinery
• Inspection, facility management, and site supervision requiring mobile audio streaming and voice prompts

When it may not be suitable

This earcup hearing protector uses passive attenuation and is not a substitute for specialized active noise cancellation systems intended for extreme low-frequency noise. It may not be ideal for users who need full face protection or integration with helmets if a headband-mounted configuration interferes with other personal protective equipment. For applications requiring certified compatibility with specific helmets or communication systems, verify fit and interoperability before use.

Key specifications

• SNR (Single Number Rating): 31 dB attenuation
• Design: headband-mounted earcup hearing protector
• Connectivity: Bluetooth audio for calls and media streaming
• Controls: integrated on-ear controls for call and audio management
• Functionality: hands-free calls, audio streaming, voice prompts

How to use

Place the headband over the head so the earcups fully cover the ears and create an effective seal. Power on the unit and pair it with a Bluetooth-enabled device following the manufacturer pairing procedure. Use the on-ear controls to answer or end calls and to control media playback. Inspect cushions and headband for damage before each use and replace worn parts according to maintenance guidance. Store the headset in a dry, dust-free environment when not in use to preserve sealing surfaces and electronics.

What to consider before purchase

• Confirm that headband mounting is compatible with other personal protective equipment you use (helmets, goggles)
• Check that Bluetooth connectivity and supported call/audio functions meet your workflow needs
• Ensure the stated SNR 31 dB attenuation is appropriate for the noise levels in your work environment

Usage recommendations

Use this headset where moderate to high noise attenuation is needed along with mobile communication; regularly inspect seals and cushions for wear and follow workplace safety rules regarding hearing protection. For tasks with extreme noise levels or where integration with other certified PPE is mandatory, confirm suitability with your safety officer.