3M 7100088423 Protective Hearing earmuffs are designed to provide hearing protection in various environments. They have an attenuation rating of 23 dB, making them effective at reducing noise levels. The earmuffs are hard hat attached, allowing for convenient wear. They feature a wireless connection type and have a battery life of 100 hours. With a net weight of 374 g, they are comfortable for most users. These earmuffs also have a level-dependent function for ambient listening and an auxiliary port for external audio input. Although they don't have Bluetooth or a built-in 2-way radio, they are compatible with noise attenuating headsets. The communication type is environmental listening, with a communication direction of listen-only. Overall, the 3M 7100088423 earmuffs offer reliable hearing protection with added features for communication and environmental awareness.