Stereo earmuffs provide protection from most low-to-medium hazardous noise levels while maintaining high-fidelity sound qualities. Technologically advanced, acoustical bass chamber enhances bass sounds that are typically sacrificed in stereo earmuffs. Balanced sound across frequencies eliminates the need to "crank up" the volume. Reinforced fork slides with handholds provide an easy and comfortable fit. Included 3.5mm input cable plugs into most MP3 players, mobile phones and more. Earmuffs do not require batteries.