3M 90543-4DC Bluetooth Hearing Protection Earmuff 24 Db Nrr

Product Description

The 3M 90543-4DC is a Bluetooth-enabled hearing protection earmuff designed for trade professionals who need both hearing protection and audio connectivity on the job. It carries a Noise Reduction Rating (NRR) of 24 dB, providing meaningful protection in loud work environments. The unit streams audio wirelessly from any Bluetooth-enabled device and includes an integrated microphone for hands-free calls without removing the earmuff. A built-in rechargeable battery powers the unit, and a 2-hour auto shut-off with low battery indicator helps manage power on long shifts. Audio Assist technology provides voice-guided setup without removing the headset.

This earmuff is suited for residential and commercial jobsites where sustained noise exposure requires hearing protection — including HVAC mechanical rooms, construction sites, and electrical panel work. The flexible headband with cutouts accommodates hard hat caps, and the low-profile, soft ear cushions allow for all-day wear. For non-Bluetooth devices, a 3.5mm audio input is available (cable not included). This package contains 4 units, making it appropriate for crew-level purchasing or contractor inventory. Installation and setup require no tools; licensed tradespeople and general laborers can deploy these units immediately.

Key Features

• 24 dB Noise Reduction Rating (NRR) for hearing protection in high-noise environments
• Bluetooth wireless audio streaming and integrated microphone for hands-free calls
• Audio Assist technology provides voice-guided operational setup without removing the headset
• Built-in rechargeable battery with 2-hour auto shut-off and low battery indicator
• Flexible headband with cutouts designed for compatibility with work caps and hard hats
• 3.5mm audio input for use with non-Bluetooth devices (cable sold separately)

Compatibility

Compatible with any Bluetooth-enabled mobile device for wireless audio streaming. Also compatible with non-Bluetooth devices via 3.5mm audio cable (not included). AC charging adapter is not included. Compatible with stand use per manufacturer specifications.

Installation Notes

No tools or licensed trade installation required. Units arrive ready to use and are charged via the included charging cord before first use. Do not expose to water or extreme temperatures during storage or use. Ensure the headset is powered down and fully charged before deployment in a high-noise work environment to avoid mid-shift battery failure.

Technical Specifications

• Noise Reduction Rating (NRR): 24 dB
• Connectivity: Bluetooth wireless; 3.5mm audio input
• Battery: Built-in rechargeable; charging cord included
• Auto Shut-Off: 2 hours
• Package Quantity: 4 units
• Unit of Measure: EA
• Weight: 3.88 pounds (package)

Standard Information

• Brand: 3M
• Manufacturer Part Number: 90543-4DC