The Caldwell E-Max Behind-the-Head electronic hearing protection combines advanced circuitry with a low profile ear cup design that's ideal for shotgun shooters and action shooters. Features sound amplification up to 20dB with automatic shut-off protection when sounds exceed 85 decibels.Caldwell E-Max Behind-The-Neck Electronic Hearing Protection21 NRR rating for effective noise reductionSound amplification up to 20dB for enhanced communicationAutomatic shut-off protection above 85 decibelsDual microphones for true stereo function and sound localizationAdjustable volume control on right ear cupAudio input jack for external devicesCushioned foam ear cups for comfortPower indicator lightPerfect for shooting sports and range activities allowing clear communication and environmental awareness while providing reliable hearing protection during firearm use.