Solar/Battery Operated - 30 miles. Low Impedance for maximum power, longer life. Solar powered, uses free energy from the sun. Performance meter that shows condition of fence. No operating costs. UL Listed. America's first solid state solar powered electric fencer. State-of-the-art solar panel for superior charging power. Complete with sealed 12 volt rechargeable battery. Weatherproof, portable outdoor model. Charges up to 30 miles of fence - 3 joules. For Large Pastures.