This Harmony XB5, double-headed modular push button has 1 red and 1 green button, operates with a spring return mechanism and uses screw clamp terminals. 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. 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. Its plastic bezel makes it ideal for applications requiring good resistance to chemical agents and/or double electrical insulation.