Annong Aquarium Flood Bubble Light Bar (20" 21LED 5.4W) Adopt a number of super-bright 57 LED,blue Lighting Fully waterproof, energy saving, long life, low fever Powerful sucking disk, convenient and substantial Rubber protective cover to prevent collision and damage The light could be submerged entirely under the water or put it out of the water and two suckers help to fix strong in the tank