This Harmony XB4 illuminated double head has 1 green, 1 red button and 1 central white pilot light, operates with a spring return / impulse mechanism. It has a metal bezel. It is marked with "I" and "O" symbols. This double-head button provides a complete 2 button interface to your machines with a single panel cut-out. It is easily installed into a standard 22mm diameter cut-outs and connected with simple screw-clamp connections. Its schematic is clearly distinguishable thanks to illuminated 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 and IP69K, making it ideal for operation in harsh environments.