controller
nounUK /kənˈtrəʊlə/
US /kənˈtroʊlər/
A controller is a thing you hold to make a game or machine do what you want.
He pressed the buttons on his controller to make the car go faster.
OTHER MEANINGS
2. A person whose job is to check that money and records are correct.
The controller checked the company's accounts.
3. A person who directs or manages how something works.
She is the air traffic controller at the airport.
4. A device that keeps a machine at the right speed or level.
The temperature controller keeps the room warm.