"Natural Crystal Himalayan Rock Salt Lamps What It Does: Releases negative ions into the air when heated Eliminates positive ions that can cause bodies to feel unwell Helps make the air fresh and clean Can reduce the effects of dust, bacteria, pet dander, odor, allergies, asthma, and even colds Emits an enchanting glow. Design Hand-crafted from natural Himalayan salt crystals Polished wooden base Electric wire and bulb UL/CE-certified cable.