This Harmony Xb5, 40Mm Mushroom Green Button Head Operates With A Spring Return Mechanism. This 40Mm Mushroom Shaped Push-Button Head Is Ideal For Situations Where Quick Actions Are Required For A Process Or Machine To Function Correctly Or Where Operator Movements Require Maximum Ergonomy. It Is Easily Combined With Harmony Range Of Contact Blocks To Perform A Large Variety Of Control Functions. It Is Clearly Distinguishable Visually At A Distance Thanks To A Prominent 40Mm Mushroom Shape. It Is Impact Resistant, Dust Resistant, Water Resistant And Vibration Resistant Thanks To Its Ip66 / Ip67 / Ip69 / Ip69K. It Has A Plastic Bezel, This Makes It Ideal For Applications Requiring Good Resistance To Chemical Agents And/Or Double Electrical Insulation. It Is Designed To Fit In A Standard 22Mm Cutout, Ensuring Compatibility When Installing In Pre-Existing Machinery. Its Wide Range Of Operating Temperatures From -40°C To 70°C Allows Versatility In Usage Of Product.