This Harmony XB4, triple head has 1 red and 2 white buttons, operates with a spring return / impulse mechanism. It is marked with "+", "STOP" and "-" symbols. This 3-function head provides a complete 3 button interface to your machines with a single panel cut-out. It is easily installed into a standard 22mm diameter cut-outs and assembled with a collar and contact blocks to fulfill a large variety of functions. It is impact resistant, dust resistant, water resistant and vibration resistant thanks to its IP66 and IP69K. It has a metal bezel, this makes it Ideal for applications requiring high impact and vibration resistance. 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 -25°C to 70°C allows versatility in usage of product.