This is the desktop display that generates a mesmerizing cyclical display evoking the rumblings of a subaquatic volcanic eruption. The tank is filled with 26 3/4 oz. of water, creating a diorama of an undersea vent with three phosphorescent corals and the ocean floor. An unseen pump hidden beneath the volcano silently draws in dozens of 1/8"-diameter translucent red and clear plastic pellets and ejects them from the cone, simulating a slow, majestic eruption. The pellets are illuminated by a red, blue, and green LED that flashes randomly to suggest glowing lava. The pellets circulate for four hours until the device turns off automatically. Plugs into AC using the included adapter. 9 3/4" H x 7 1/4" W x 2 1/2" D. (3 lbs.)