Headphone ini khusus digunakan untuk audiometer. 3M Peltor Optime Rrecommended for Audiometer and TWA noise exposures up to 101 dBA Stainless steel headband distributes weight for low pressure fit Earcup pivot points tilt for comfort that adjusts to individual wearers Noise Reduction Rating (NRR) 27 decibels Specifications : 20 - 20.000Hz 32ohm 98dB Neodymium Magnet 40 mm speaker diameter