Water based unit disrupts geese sleep patterns causing them to move to another pond. The product floats in the water and works at night, 7 days a week. Solar powered no changing batteries or running electricity to the site. Maintenance free. Environmentally safe and effective geese control. Barely noticeable to the human eye. Solves Geese problems quickly! Item has an integrated securing point. Unit uses lithium battery which is integrated onto the board and then coated in a plastic. This is done because of the product being outside constantly. The whole light is replaced when the old light stops working.