Abstract: A controller for a warning light is disclosed. The controller is composed of a housing, a light emitting element and a control unit. The control unit is in operable communication with the light emitting element of the controller and a light emitting element of a warning light. The controller instructs the light emitting element of the warning light and the light emitting element of the controller to display light in the same lighting mode, which allows vehicle operators to immediately know the lighting mode of the warning light by viewing the lighting mode of the controller.