The Caldwell Shooting 487309 is a low-profile E-Max hearing protection designed with efficient circuitry and a compact earcup. This model is perfect for shotgun shooters and action shooters. It features two microphones that amplify sounds below 85 decibels. This function enhances regular communication, range commands, and environmental sounds. When sounds exceed 85 decibels, the microphones automatically shut off for a brief moment to safeguard the shooter\'s hearing. Each cup houses a microphone, enabling true stereo sound and facilitating the identification of a sound\'s directional source. This model comes with an integrated audio input jack for music playback. It operates using 2 AAA batteries (not included) and offers a 23NRR.