This Harmony XB4 Integral LED is supplied with 6V AC/DC BA9s base and provides green light. It is compatible with Harmony XB4 and XB5 illuminated push buttons. It is easily installed into a standard 22mm diameter controls and signalling units. Its simple modular design facilitates post installation servicing, modification and adaption of machines by non-specialists. It is designed to fit with a standard 22mm control and signaling units, ensuring compatibility when installing in pre-existing machinery. It features high brightness for easy identification of function and operation mode.