This is the headset of the R-392 man pack radio. It uses a dynamic microphone, as well as a dynamic speaker. This is a typical setup for army radios, since dynamic microphones are more resistant then capacitor or piezo based ones.
However most amateur radios only work with those. So I had put in a piezo microphone, in order to get this thing running with my Wouxun KG-UV6D. The speaker is good to go without any modification.