Attack Spider is a bird deterrent, especially suited for deterring wood damaging woodpeckers. Operates on 2 "AA" size alkaline batteries (not included). Works best when mounted under an eave or soffit. Since the Attack Spider is NOT weather resitant it is best to protect it from the elements by anchoring it to the underside of an overhang by utilizing a screw that causes the spider to retract into a plastic container such as a tupperware bowl. This sound activated device drops down suddenly when a bird starts pecking (drumming) on the structure. Its legs move wildly and it emits a sound which frightens the bird away from the area.