SM18N4-Ex Audio Details Technical Specifications Atex Intrinsically Safe Remote Speaker Microphone (IP57)Complying with requirements for instrinsic safety this remote speaker microphone enables easy and safe operation whilst working in challenging environments.Find a dealerHighlightsFunctionsTechnical SpecificationsMicrophone sensitivity -42dB ±2dB @1KHz, PTT cycles ≥100000, speaker sensitivity 90dB ±3dB @300Hz to 3KHz average, impedance 20Ω ±15% @1.5KHzRelated Products PD792i-Ex