... Industry safety + OEM avaliable + Electronic Earmuff NHP-230S Industrial Earmuff NRR: Noise Reduction Rating proved to ... as no gun noise in shooting ranges,2. No engine noise ... with a electronic circuit. The sound reception is stereophonic, with maintained directional sound.Receiver/Input ... capabilities for: Computer, AM/FM Radio, CD, DVD, MP3 Player, TV or other electronics using a 3.5mm mini jack ...