This Harmony XB4 neon bulb for signaling is supplied with 280 to 415V AC and provides clear light.It is compatible with Harmony XB4 and XB5.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 featyres high brightness for easy identification and signalling of function and operation mode.