This Harmony XB4 neon bulb for signaling is supplied with 220 to 240V AC and provides blue light.It is sold by 10 pcs and 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.