Innovative repellent replaces an electric fence. Includes 3 units, aromatic lures, and cotton balls. Each unit attracts deer to the posts with a lure scent. When the deer touches the post, they receive a small shock, 400 volts, that harmlessly repels the deer from your yard. The shock is even less voltage than a static electrical shock, yet enough voltage to scare deer. Safe to use around children and pets. Each post covers approximately 400 sq feet. Easy to assemble and install. Requires 2AA batteries, not included.