Technical Parameters Category Specification Model A22-I4M Product Type Illuminated Pushbutton (Momentary Action) Series A22 Mounting Hole 22 mm Front Bezel Oil-tight, Dust-tight (IP65 rated) Button Type Round, Momentary Lens Color Yellow Illumination Incandescent Bulb Contact Block Not Included. This is only the operator (button and lamp assembly). A separate contact block (e.g., A22-C) must be purchased. Voltage for Lamp Depends on the specific bulb installed (e.g., 6V, 12V, 24V, 48V, 100V, 110V, 120V, 200V, 220V, 240V). Must be specified separately.