API 4WW Standard Water Wiggler Water Agitator for Bird Bath Needle and how would I replace

and how would I replace them

Number of batteries required : 3

Voltage/Engine: 115 - 1 - 60

and high speed steel pilot bit

API 4WW Standard Water Wiggler Water Agitator for Bird Bath Needle and how would I replaceHighlights: Attracts birds, helps prevent the spread of West Nile Virus by eliminating stagnant water in birdbaths Easy to install Just place it in your bird bath and let it work Silent operation May use with heated bird bath in winter It operates on two D cell batteries (not included) for up to two months of continuous use under normal conditions, and is completely silent The moving water created by the Water Wiggler will help attract birds to your