3M 7100204390 is a Protective Communication product designed specifically for Hearing Protection. Its Earmuffs style provides excellent attenuation with a rating of 27 dB. It offers both wired and wireless connection types, making it convenient for any situation. This product is CSA Class A certified and is not intrinsically safe. With a battery life of approximately 18 hours and a lithium-ion battery type, it ensures long-lasting performance. The lightweight design, weighing 434 g metric or 15.3 oz imperial, along with the neckband suspension method, offers comfort during use. It features Bluetooth and supports various communication types like environmental listening, external audio input, and two-way radio. The compatibility with Kenwood and Motorola radio brands offers versatility. It also includes a 4-pin XLR auxiliary port and communication via external 2-way radio. The built-in 2-way radio and dynamic microphone class/type further enhance its functionality.