Rest assured...moving water attracts birds whether in warm or cold weather and helps 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. This little gem is easy to instal. Just place and go! No wiring...no plumbing. Count on a long battery life...operates on two D-cell batteries (not included) and operates 24 hours a day. It may be used with heated birdbaths in winter to agitate the water and attract more birds.