http://www.patiogardenponds.com/ We would like you to know Water Wiggler w/Sound; this is not an ordinary water wiggler because this wiggler has a sound that will surely attract more birds in your garden. This wiggler helps prevent the spread of West Nile virus by eliminating stagnant water in bird baths; the unique agitator action of Water Wiggler w/Sound creates continuous ripples in the water, preventing mosquitoes from laying eggs. This water wiggler is very easy to install; just place it and go, there is no wiring or plumbing required and it even has long battery life. Water Wiggler w/Sound may be used with heated bird baths in winter to agitate water and attract more birds.