Great for crystals! Round 3.35 inch light base emits glowing lights in four bright LED colors. One button (on and off). The base changes from colors slow flashing, colors fast flashing, or continuous single colors in 4 options of red, green, blue, and white. Mirrored top. Lightweight design that is ideal for your traveling altar. Operates by battery or USB. Takes 3 AAA Batteries (not included).