Hi danni.
yes we have a walkie talkie held by someone outside the room and a hearing mike (like Madonna wears) inside the room. That was mmmmm they can communicate together. Head sets are great with a hood while the hand held is good for the mask.
something like this. https://www.ebay.co.uk/i/322527046245?chn=ps&norover=1&mkevt=1&mkrid=710-134428-41853-0&mkcid=2&itemid=322527046245&targetid=879554672798&device=m&mktype=pla&googleloc=9045161&poi=&campaignid=9441268971&mkgroupid=96107915015&rlsatarget=pla-879554672798&abcId=1139366&merchantid=118933575&gclid=Cj0KCQjw7qn1BRDqARIsAKMbHDZsGmoMFhewp_G9MTh3IB2bLy5fq6UDTcu37NojZHTiwivfTx2lm14aAjXNEALw_wcB