Radians Inc. R3200ECS: The Radians R-Series R-3200 Dual Mic Earmuff is an electronic sound amplification earmuff. It is built with two independent microphones that are designed to pick up and amplify low sound levels like conversation while compressing and squashing sounds that exceed safe levels such as gunshots. The compact folding feature is excellent for easy storage. Additionally, the R-Series features 3.5mm Stereo input jack and patch cable, which works with most smart devices.