This Harmony spare incandescent bulb is fitted with BA9s base 2.4W.This spare incandescent bulb is a lighting accessory for Harmony illuminated push buttons.It is supplied 120V to 130V AC/DC.Its simple and modular design allows easy installation.It weighs 2g.It is compatible with Harmony XB4, XB5, XB7.It is sold in lots of 10.