Lit, it glows with tiny pinpoints of light, like a starry sky. Unlit, its silvery surface reflects everything around it. Because it's cordless, you can put it anywhere: on a table, on a shelf, among plants or holiday greens, though don't leave it exposed to the weather. A charming addition to any patio table, mantle, or nightstand. Available in Small (about 5" diameter) or Large (8" diameter). The more, the merrier. Takes 3 AAA batteries. Mercury Glass is a style of glass dating back to 19th century Germany. The name was given because the mirror finish resembles the element mercury, but there is actually no mercury in Mercury Glass.