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. Takes 3 AA batteries. Set includes 1 large sphere and 2 small spheres. Small sphere is about 5" diameter. Large is 8" diameter. The more, the merrier.