This Schneider Electric Harmony XB4 Integral LED is supplied with 6Vac/dc BA9s base. It is compatible with Harmony XB4, XB5 and XB7. This Integral LED with BA9s base is designed to be a long lasting bright indicator with energy efficient solution. It is easily installed into a standard 22mm diameter controls and signaling units. Simple modular design facilitates post installation servicing, modification and adaption of machines by non-specialists. Designed to fit with a standard 22mm control and signaling units, ensuring compatibility when installing in pre-existing machinery. High brightness for easy identification of function and operation mode.