The Saf-T-Ear buds pro is an active hearing protection ear plug that uses electronic circuitry to restore the situational awareness that is generally lost when using traditional ear plugs. Great for use in loud environments like construction sites, concert venues, and other outdoor activities where hearing is needed to be preserved while you remain alert to your surroundings. Using adaptive attenuation the buds pro will allow you to hear naturally when sound levels are safe. As sound pressure levels increase, the circuitry gradually adjusts to protect you from the loud noises and returns to the natural level when the sound level goes below dangerous levels.