3M 7100088456 Protective Hearing Earmuffs are designed for noise attenuation with an attenuation rating of 21 dB. This wired, headband-style hearing protection is ideal for environments requiring environmental listening communication. It features a level-dependent function for ambient listening and a 3.5mm auxiliary port for external audio input. With a net weight of 303 g and a battery life of 100 hours, these intrinsically safe earmuffs provide comfort and durability. They do not have Bluetooth or a built-in FM/AM radio but are compatible with noise attenuating headsets. Manufactured by 3M.