EHN12-Ex Audio Details Technical Specifications Atex Intriniscally Safe Swivel Earpiece with Microphone PTTIntrinsically safe, ergonomically designed swivel earpiece Swivel Earset with microphone PTTFind a dealerHighlightsFunctionsTechnical SpecificationsMicrophone sensitivity -50dB ±4dB @1KHz, impedance ≤ 2.2KΩ @1KHz, PTT cycles ≥100000, speaker sensitivity 108dB ±3dB @1KHz, impedance 150Ω ±15@ &1KHz, rated power 50mW, maximum power 100mW