Works like an air purifier. Dimensions: 4.25"L x 4.25"W x 7.5"H. Requires one 25W bulb (not included). Relax in the warm glow of this Himalayan Natural Salt Crystal Lamp. It is wholesome and good for a creative mind. Bring divine harmony to any room with this beautiful salt crystal lamp. The therapeutic glow of orange hues infuses a natural calm, bringing the mind and body to a gradual sense of tranquility and well being. It is scientifically proven to work like an air purifier and is often called Nature's Air Purifier. When the lamp is lit, it emits negative ions that fight against positively charged particles like allergens, smoke, dander, pollens and other air pollutants that cause a stuffy and sluggish feeling.