SM19A1 Audio Details Technical Specifications Portable Microphone with Keypad (IP54)Ergonomically designed portable microphone with large programmable keys and emergency call button for ease of use and convenienceFind a dealerHighlightsFunctionsTechnical SpecificationsMicrophone sensitivity -21dB ±3dB @1KHz, impedance ≤ 2.2KΩ, PTT cycles ≥100000, operating temperature -30°C to +65°CRelated Products MD782i