Havahart 5250 Electronic Deer Repellent Uses unique, patented technology that gives deer a harmless, static shock to condition them to avoid your yard and leave your landscape intact Creates a psychological barrier that manipulates instinctual behaviors to keep deer off your property, without the use of harmful chemicals Electronic Deer Repellent is a natural solution that is safe for deer, pets and your family. Covers approximately 1,200 sq. ft. Includes 3 Electronic Deer Repellent posts, Acorn scented deer lure, Cotton balls, and Instruction Manual. Requires 6 AA batteries (not included).