Another water mover for your birds year round to prevent the spread of west nile virus by eliminating stagnant water in birdbaths. The unique agitator action creates continuous ripples in the water, preventing mosquitos from laying eggs. It is easy to install. Just place and go! No wiring...no plumbing. It has a long battery life...operate on two D-cell batteries (not included). And if you like, will go 24 hours a day. It may be used with heated bird baths in winter to agitate the water and enhance attracting the flurry of birds you have already enticed with your feeders.