12 volt - Battery Operated - 30 miles. 12 volt advanced solid state circuitry. Performance meter that shows condition of fence. Low impedance for maximum power, longer life. Compact design, weatherproof portable - outdoor model. Use with 12 volt storage battery, complete with battery clamps. Ideal for livestock or predator control. Medium to large pastures. UL listed. Charges up to 30 miles of fence - 3 joules.