With 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. The Magnum 12 provides up to three months of continuous operation between battery charges.. Built-in performance meter tells the exact condition of the fence. Battery clamps included. Range: 30 Miles. Joules Low: 1.1. Joules High 3.1+.