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David Clark noise-attenuating headsets offer hearing protection and clear communication for many maintenance-of-way applications, and can be tied directly to two-way, portable and mobile radios. Typically, two-way systems consist of a headset and a radio adapter with a push-to-talk switch that connects to a mobile or portable two-way radio. Headset models are available in over-the-head and behind-the-head styles and come with noise-cancelling boom-mounted microphones.