NIMAX's hearing protection products, we can proud to say it is one of the best hearing protection series products in the world. Our hearing protections are high quality with excellent noise protection and explosion protection. Our hearing protector according to: USA Lab's ANSI S12 45 Test Standard, the Test Result NRR Value is 30db. OSHA adjusts NRR is 27db. This Protector can reduce its surrounding noise in different environment by adjusting its sensitivity to sounds. Reaction time of the sound sensitivity control system is only 2 milliseconds. Our Hearing Protector is equipped with dual built-in microphone, volume controls and speakers to provide natural directional hearing on both sides of the receptors. Receiver/Input capabilities for: Computer, AM/FM Radio, CD, DVD, MP3 Player, TV or other electronics using a 3.5 mm mini jack. While reducing sounds below 75dB, it can amplify desired