Person with a raised hand explaining, teaching, presenting, discussing, waving.

Person With A Lifted Hand

A recording microphone with a pop filter.

Recording Microphone With Pop Filter

A tilted microphone with a button and no cable. 

A large film or tv camera on a rolling stand. 

A round bubble with a teacher or presenter inside, giving a class and pointing a board.

A busy and overworked manager or employee surrounded by charts, graphs, and notifications.