SM19A1 Audio Details Technical Specifications Handheld Microphone with Keypad (IP54)Ergonomically designed handheld microphone with large programable 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 HM782 Mobile Radio MD782i