Siemens Illuminated twin p/button, green: I, red: O, 22mmProduct Overview Illuminated twin pushbutton, 22 mm, round, metal, shiny, green: I, red: O, pushbuttons, flat. Part of the SIRIUS ACT series, this illuminated twin pushbutton combines dual switching functionality in a single command point. Features two momentary contact switching functions with industry standard color coding green for "I" (on start) and red for "O" (off stop). Constructed with genuine metal and engineered with smart functions for