SM13M1 Audio Details Technical Specifications External Microphone and SpeakerHigh quality , IP55 compliant and noise canceling microphone enabling clear and concise audio transmission in noisy operating environmentsFind a dealerHighlightsFunctionsTechnical SpecificationsMicrophone sensitivity -52dB ±3dB @1KHz, speaker sensitivity 91dB ±3dB @300Hz to 3KHz Average, impedance 16Ω ±15% @1.5KHz, operating temperature -30°C to +65°CRelated Products BD612i Two-Way DMR Radios PD502i UL913 PD562i UL913 Intrinsically Safe Radio PD482i UHF/VHF Two-Way DMR Radio