Enjoy your bird bath both day AND night! The Aurora Water Wiggler will light up at dusk and provides three hours of beautiful colors as the dome slowly shifts through the spectrum. A sensor on the underside of the Aurora Water Wiggler turns the unit on at dusk. The lights will run for 3 hours and automatically shut off, then come back on the following evening. The Water Wiggler® features a unique agitator action that creates continuous ripples that help prevent the spread of West Nile Virus by eliminating stagnant water in bird baths. The Water Wiggler is easy to install...just place it in your bird bath and let it go to work! The moving water created by the Water Wiggler® will help attract birds to your bath, while preventing mosquitos from breeding in the water. There is no wiring and no plumbing. It operates on two D-cell batteries (not included) for up to two months of continuous use under normal conditions, and is completely silent. Can be used in your heated bird bath in the winter, too. Patented. One year warranty.