Garden & Backyard Electric Fence Protection K, Easy Do It Yourself Electric Fence That Fences A 50' x 50' Area, With 3 Adjustable Wires, Contains 48" Posts That Will Deter Deer In Addition To Smaller Wildlife, Battery Operates On Common "D" Cell Batteries, No Electric Outlet Or Extension Cord Is Used, Has Wires That Are Made Out Of Polywire Rather Than Aluminum For Better Visibility & Safety.