Copper Dripper/Fountain Hummingbird. Electric Pump only. The water depth in the bath for the fountain to operate at its best is approximately 3 inches. The minimum height of the water level for the pump to continue to work is approximately 2 inches. The dimension height from the metal base plate to the bottom of the circulating pump is approximately 3 inches. There is not a safety shut off if the water should go down too far to function. The Birdbath is sold separately... this is the top dripping fountain top only. You would still need a dish/stand for the water. See the compatible item BC-AG972 below. The fountain dimensions are 13 inches tall and 7 inches wide.