This black 3 x 3 inch electric base emits glowing lights in five ultra bright LED colors--four colors and white--that light up in sequence creating the effect of gradually changing colors. Place your crystal over the 3/4 inch round lens and watch it magically transmit the colored rays of light. Each time the base is turned on, a different color sequence starts. There are four color sequences of 3 colors each and one white sequence. You can freeze color with any sequence. To choose a single color, just press the STOP button. Base sits on four non-skid pads. Operates by battery. Adapters sold separately. Three AAA batteries are included.