Personal Color-Changing Salt Crystal Lamp with USB. "When lit, salt crystal lamps emit negative ions, which help neutralize harmfulness of electromagnetic fields (EMFs). Via USB cord, Personal Salt Crystal Lamp turns on when you boot up your computer. Color-changing cycles through: blue, green, red, purple, pink, yellow, & white. 75 sq. ft of coverage (non-replaceable LED bulb lasts @. 20,000 hours @6 years if you use your computer 8 hours a day.)"
