lavalier microphone
noun
variants or less commonly lavaliere microphone
: a small microphone that is hung around the neck or clipped to the clothing of the user
Example Sentences
Recent Examples on the Web Record that postgame interview after a team wins a big game and get the words right from the mouth of the player who won it with the help of a lavalier microphone. 
Chris Hachey, BGR, 14 June 2021 Nine months before these Winter Olympics commenced in his native country, Jim Paek stood on a stage halfway around the world, speaking into a lavalier microphone and gesturing with a presentation remote. Alex Prewitt, SI.com, 13 Feb. 2018
Chris Hachey, BGR, 14 June 2021 Nine months before these Winter Olympics commenced in his native country, Jim Paek stood on a stage halfway around the world, speaking into a lavalier microphone and gesturing with a presentation remote. Alex Prewitt, SI.com, 13 Feb. 2018 Word History
First Known Use
circa 1962, in the meaning defined above