As this Himalayan salt lamp warms up with the light bulb it emits negative ions into the air. Negative ions cause harmful air particles to clump together and fall to the ground. This process may help relieve symptoms of asthma, sinusitis and common allergies. In addition to these health benefits, this salt lamp makes a very unique, healthy and beautiful gift. Every piece is distinctly hand carved to retain the unique natural look and beauty of salt crystals, so no two salt lamps are alike. Note: Due to the nature of Himalayan Salt Lamp products, size and weight may vary. Made from the finest salt crystals in the foothills of the Himalayas. There is no salt in the world that can compare with Himalayan Salt in purity and color. UL approved cord and light bulb included. Approximate measurements: Height: 7-8" Width: 4.0-4.5"