That’s the com system we used. I was HAZWOPER certified working in radioactive areas. The mic was strapped to our necks and was against our throats. Head gear to listen to each other. We wore the “moon suits” supplied with a filtered air line into the suits. Carried an escape tank of air on our hips.Pretty exciting having a thin plastic type material between you and very nasty radioactive waste. We dismantled large presses, glove boxes and machinery used in the production of nuclear weapon triggers.
We used that com system with full face and PAPR respirators when needed. It worked great.