This lamp with a metal base and glass shade illuminates thanks to a 3V lithium battery and an LED (light-emitting diode). Both are included with the lamp. You can expect the lithium battery to last approximately 50 hours, at which time you can replace it with the Lithium Battery Set. The LED is not replaceable, which isn't a problem because it will last approximately 4,000 hours.
The lamp is 1/12 scale, which is the most common scale for dollhouses and dollhouse miniatures. It means that if an object is 12 inches in real life, it is sized down to a one inch as a miniature.