The David Clark CS6601i Earphone headset is used with C6600i Body Switch Adapters which are ideal for potentially explosive, hazardous or toxic environments. Quality components and manufacturing ensure clear, reliable and safe communication. The CS6601i has a dynamic throat microphone and is ideal for use under Haz-Mat apparel and protective clothing. The CS6601i and all Series 6600i headsets would be suitable for applications such as oil rigs, gas platforms, oil fracking operations, paper products manufacturing and other industrial environments.