3M Peltor Listen-Only Headset, MP3 and 2-Way Radio Compatible, Hearing Protection, Gray, Ear Protection, NRR 25 dB, Excellent for heavy equipment operators, airport workers, racing, and construction Designed for high noise environments High quality audio reception Noise reduction rating 25 dB 3.5mm stereo plug adaptable Excellent for heavy equipment operators, airport workers, racing, and construction