This Harmony XB4 double-headed modular push button has 1 red and 1 green button, operates with a spring return mechanism. It has a metal bezel. 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. Its schematic is clearly distinguishable thanks to clear colors and markings, minimizing errors during initial wiring and later maintenance operations. 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.