3M E A Rsoft 073 781 ~ 073 78 E A Rfit Microphone Assembly1 Cv 7100077867 Length_36cm the 3M Replacement Hood with TA the 3M Replacement Hood with Sealed Seams and Inner Shroud Great for outdoor use and very wet environments or if you need to wrap around tight fitting equipment The complete system issues a pass or fail rating for each individual based on the employee's personal attenuation rating (PAR) The 3M E A Rfit Dual Ear Microphone Assembly works with the 3M E A Rfit Dual Ear Validation System to help employers determine whether workers are receiving adequate hearing protection from their hearing protector