To capture low level sound, the Impact Sport employs built-in microphones that amplify range commands and other important sounds. Users enjoy full, clear directional hearing in stereo. For protection, the Impact Sport actively listens and automatically shuts off amplification whenever harmful sound levels are reached. The earmuffs effectively block any noise, continuous or impulse, of 82dB or more. An external audio imput allows you to connect your IPOD or other audio source. It has a black leatherette headband with hunter green ear cups, a snap-on lid for quick and easy battery replacement, outstanding battery lifetime, and includes 2 AAA batteries.