PW100 electric fence energizer from Power Wizard. Plug-in, low impedance energizer control 1-3 acres or 1-3 miles of fence wire. Recommended for small areas and small animals. 110 V; 0.1 joule output. Feature high performance digital technology, rugged all-weather construction, internal lightning shield, big easy-grip knobs and heavy-duty, long life construction. Plus, easy to service. 3 year warranty.Only Power Wizard energizers feature state-of-the-art ultra low impedance technology to increase energy output to maintain consistent shock power on fence lines which have deteriorated or become heavily weeded. Feature high performance digital technology, rugged all-weather construction, internal lightning shield, big easy-grip knobs and heavy-duty, long life construction. Plus, easy to service. 3 year warranty.