3M™ HEARING PROTECTION SOLUTIONS INTRODUCES NEW NON - ELECTRONIC LEVEL - DEPENDENT EARPLUG

In the Open Mode, a patented, non-linear acoustic filter allows lower-level sounds to pass without minimal interruption, but high-level impulse noises are instantly restricted.  This feature allows the wearer to hear nearly normally for good situational awareness until a loud impulse noise occurs.  The more intense the impulse, the more it is limited.