SM-20 Handheld Mic Details Technical Specifications The SM-20 is a handheld microphone with PTT button and keypad for the MNC580 PoC Mobile Radio. Includes mounting bracket.Find a dealerHighlightsFunctionsTechnical SpecificationsMicrophone Sensitivity:-42±3 [email protected] kHz 3.0V 2.2kHz; 0 dB=1V/PaSpeaker Impedance:32Ω±15%@1kHzSpeaker Power:1W rated; 1.5W maxRelated Products MNC580 PoC Mobile Radio