The Magnum 12 features Parmak's exclusive built-in performance meter. Tells you the exact condition of your fence. Takes the guess work out of electric fencing. More power than you ever imagined possible from a battery fencer. The Magnum 12 features output equal to power line operated models. Shocks through wet weeds and brush. No moving parts means years of dependable, trouble free services. The most economic 12-volt solid state fencer operation on the market. Magnum 12 provides up to three months of continuous operation between battery charges. Weatherproof, portable outdoor model for installation anywhere on your farm. 12 volt Battery-operated 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 Shocks through wet weeds & brush Medium to large pastures UL Listed Charges up to 30 miles of fence - 3 joules*.