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Impact M5-PDM-1-NC Noise Cancelling Behind-the-Head Headset with Boom Mic, Motorola XTS 3.5mm Conversion Impact M7-PDM-2-CABLE for use withImpact PDM 1 NC Noise Cancelling, Behind the Head Dual Speaker Headset with Boom Microphone. This heavy duty headset is the ideal solution for demanding, loud environments including airports, transportation hubs, factories, construction sites and manufacturing facilities. The headset strap is fully adjustable and can be used with most helmets and hats. The fully adjustable boom microphone allows for the microphone to be positioned directly in front of