Caldwell E-Max Electronic Earmuffs amplify the sounds you want to hear and squelch the ones you don't. Was that a twig snapping? Could be your new trophy. Here's one way to know for sure: E-Max Electronic Muffs from Caldwell, with 2 microphones that amplify "quiet" sound (below 85 dB) like human voices and environmental noises. Upon shooting, the baffle technology shuts the microphones down to protect your hearing. 25 Noise Reduction Rating. Requires 4 "AAA" batteries (not included).Order Today!