This oil warmer plugs directly into your wall outlet. Place scented oil into the top dish and plug the unit into a standard wall outlet. The 35 halogen watt bulb (included) warms the oil releasing the scent. Top dish is removable for easy cleaning. Dimmer switch allows you to control both the brightness of the light and the intensity of the fragrance. Measures 5.5" tall. Perfect addition to any room in your house. Can be used as a night light.