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David Clark H6740-M IS Headset Microphone – Behind-the-Head Modular (40416G-58) Epoxy Laminating System Lowery discusses at length theDavid Clark H6740 M IS Headset Microphone Behind the Head Modular (40416G 58) Overview The David Clark H6740 M IS Headset Microphone (40416G 58) is an Intrinsically Safe (IS) rated, behind the head modular headset system designed for direct radio communication. Built for high noise environments, this headset ensures crisp, reliable transmission while meeting strict safety standards. Key Features Intrinsically Safe Design: Engineered for use in