Natural crystalline salt formations that are millions of years old are buried deep within the Himalayan Mountains. These formations are hand carved by artisans to create exquisite lamps that produce a soft and gentle glow. When lit, these therapeutic lamps produce negative ions that are thought to cleanse the surrounding air of impurities created by electrical equipment. Conveniently plugs into your computers USB port. No need for batteries. No need to plug into the wall! Economical color changing LED bulbs mean less energy consumption and over 20,000 hours of life!