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This technology uses acoustic meta-materials to create a passive hearing protection device that can attenuate incoming acoustic pressure waves in specific frequency range. Unlike in traditional passive hearing protection devices,  the acoustic transmission coefficient in the invented design decreases with an increase in the incoming sound pressure level by utilizing a water droplet in the transmitting channel. The enhanced interaction of the acoustic wave and the meta-materials makes the size of the device few centimeters that weighs in tens of grams.