This modular red push button Harmony 9001K has 2 positions and operates with spring return. It has a round shape with a 35 mm mushroom head and fits into a 30 mm hole. This 35 mm mushroom-shaped push button head is ideal for situations where quick actions are required for a process or machine to function correctly, or where the operator's movements demand maximum ergonomics. It easily combines with the contact blocks of the Harmony series to perform a variety of control functions. Its distinctive mushroom shape makes it clearly visible from a distance. With an IP66 protection rating, it is shock-resistant, dust-tight, waterproof, and vibration-resistant, making it ideal for use in harsh environments.