Lightly touch the base to turn it on, off, or adjust the brightness three levels from low to high. A small glass container inside holds drops of essential oil (not included). Heated by the lamp, the scent diffuses softly through the room. Laser-cut polished aluminum cylinder lamp is 4" diameter, 6½ " high. 60" cord. Takes a G9 Xenon 20-watt bulb (included).