These Glowing Embers work with a 12 Volt Electrical System. Add a soft glow to any miniature fireplace. Our glowing embers come equipped with a special orange-colored bulb to give the log set a true-to-life glowing appearance. This unit will not flicker the dollhouse lights, works with any 12-volt system and requires no separate transformer. The included bulb is an easily replaceable screw-base type with a Hong Kong type plug attached to the small gauge, 24" long power cord.