controller
/kənˈtɹəʊlə/noun
One who controls something.
Related words
consoleAn instrument with displays and an input device that is used to monitor and control an electronic system.joystickA mechanical control device consisting of a handgrip mounted on a base or pedestal and typically having one or more buttons, used to control an aircraft, computer, or other equipment.modemA device that encodes digital computer signals into analog telephone signals and vice versa, allowing computers to communicate over a phone line.earbudsA small earphone designed to be placed in the ear canal for use with portable sound systems.adapterA device or application used to achieve operative compatibility between devices that otherwise are incompatible.speakerOne who speaks.