Made from beautiful Himalayan crystal salt that is mined in the foothills of the Himalayan Mountains. The natural color of a salt lamp adds beauty to any decor.USB Salt Lamps are truly unique with a white Himalayan salt crystal that changes colors when plugged in to a computer or USB adaptor. Salt lamps may sweat with excessive humidity. If moisture begins to collect on the surface of your salt lamp, turn it off and wipe it down with a cloth. Your lamp should not be sprinkled with water or left outdoors. To dust your salt lamp, simply wipe with a damp cloth. lamps are handcrafted making each piece unique. Color, shape, size and weight may vary. USB adaptor not included.