This Harmony Xb5, Double-Headed Modular Push Button Has 1 Red And 1 Green Button, Operates With A Spring Return Mechanism And Uses Screw Clamp Terminals. It Is Marked With I And O Symbols. This Double-Headed Push Button Provides A Complete 2 Button Interface To Your Machines With A Single Panel Cut-Out. It Is Easily Installed Into Standard 22Mm Diameter Cut-Outs And Connected With Simple Screw-Clamp Connections. It Is Impact Resistant, Dust Resistant, Water Resistant And Vibration Resistant Thanks To Its Ip66 / Ip67 / Ip69 / Ip69K, Making It Ideal For Operation In Harsh Environments. Its Plastic Bezel Makes It Ideal For Applications Requiring Good Resistance To Chemical Agents And/Or Double Electrical Insulation.