16-1/2"D x 3-1/2"H, Electric Heater Base, For Galvanized Poultry Waterer, Prevents Water From Freezing In Temperatures As Low As 10 Degrees Fahrenheit, Outdoor Use, In A Dry Sheltered Area, Cord Should Be Protected From Animals & Used With A Ground Fault Protected Outlet, Unit Will Not Draw Electricity Until Temperatures Drop Below Freezing, Uses Less Than 1A Per Hour.