Product Description Parmak MAG12-UO 12-Volt Magnum Low Impedance Battery Operated 30-Mile Range Electric Fence Charger Addition features: • Performance meter that shows condition of battery and fence line • Low impedance for maximum power, longer life • Compact design, weatherproof, portable – outdoor model • Use with 12 volt storage battery • Ideal for livestock or predator control • Medium to large pastures • UL Listed • Charges up to 30 miles of fence – 3.1 joules* From the Manufacturer Parmak MAG12-UO 12-Volt Magnum Low Impedance Battery Operated 30-Mile Range Electric Fence Charger