Features:

Includes audio cable to plug in MP3 player, smartphone or other personal listening device

Volume management technology maintains sound levels from portable audio equipment at safe levels

SNR of 31 dB provides protection from most low and medium levels of hazardous noise

Easy to use - noise blocking is constant with no batteries required, while audo power and volume controlled via mobile device

Provides high quality sound with excellent bass chamber enhancing bass sounds typically sacrificed in traditional protective stereo earmuffs