3 color changing LED lights with a mirror top provide the perfect lighting effects to accent your jellyfish, crystal figurines, or other collectible. LOW BATTERY INDICATOR: If only one light is operating, please replace batteries with new Akaline, NiOx, or Lithium Batteries. The units are designed to only have one light turn on when batteries are low/not high enough capacity. Often times, this issue can be solved by replacing with recommended battery types.