OPSMEN M31-V2 Sound Amplification Gun Shooting Noise Canceling Hearing February 15, 2019 admin OPSMEN M31-V2 Sound Amplification Gun Shooting Noise Canceling Hearing Protection Earmuff Green. EARMOR by OPSMEN M31-V2 Suppresses sudden noise like gunshot above 82 dBA. Provided with electronic res... Read More