4WW Water Wiggler Water Agitator, Bird Baths Water agitator for bird baths; attracts birds discourages mosquitoesAgitator action creates continuous ripples in waterNo wiring and no plumbing; operates silently on two D-cell batteries (not included)Up to two months of continual useMay also be used in a heated bird bath during winter Need more information on this product? Click here to ask.Batteries are required