DESIGN: The grey ceramic cover features flecks to imitate real spa-stone coloring. USE: Drop a few of drops of essential oil on refillable oil pad, then re-assemble warmer. Gently warms oil to release the fragrance from oils for aromatherapy in small spaces. OUTLETS: Pluggables can be used in both vertical and horizontal outlets by twisting the plug base, making them ideal for above counter outlets in small rooms and spaces. Fits Standard US 3 prong outlets. NIGHT LIGHT: Can cycle through 8 LED colors, choose to hold on one color, or leave the light off. INCLUDES: Pluggable diffuser, decorative ceramic cover, and 5 replacement pads. Elegant home decor is the focus of every Airome diffuser, and each is made to complement your personal taste.