The Impact enhances user awareness through advanced sound amplification technology. It allows wearers to hear important communication – other co-workers, alarms and warning signals – at a safely amplified level. Positioned microphones provide more natural, directional hearing. Through an advanced response technology, Impact reverts to passive earmuff mode when noise reaches 82 dB or above. Reverts to Passive Hearing Protector When Noise Reaches 82 dB.