Radians R-Series R3200 Dual Mic Earmuff -Two independent microphones pick up and amplify low sound level noises while compressing sounds that exceed safe levels. Compact folding feature for easy storage. 3.5mm stereo input jack and patch cable works with most smart devices. Electronic earmuff amplifies low level sounds while compressing noises that exceed safe levels 3.5mm stereo input jack and patch cable (included) enable playback from smartphone or digital audio player Two microphones LED ON/OFF indicator light prevents unintentional battery discharge Premium adjustable headband Compact folding feature