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Acoustic Shock Protection Noise- cancellation earphone ECM noise- cancellation microphone A neodymium magnet system for accurate reproduction and balanced audio Frequency Responses 300hz-3400hz Low sound pressure- Less than 118db Acoustic Shock Protection Noise- cancellation earphone ECM noise cancellation microphone A neodymium magnet system for accurate reproduction and balanced audio Frequency Responses 300hz-3400hz Low sound pressure- Less than 118db |