Featuring the latest state-of-the-art solar panel with superior charging power the Magnum 12 Solar-Pak eliminates battery recharging, thereby saving you time and money. The sun`s energy charges the fencer by day and a sealed 12-volt rechargeable battery powers the fencer at night. Battery included. The Magnum 12 Solar-Pak was designed, developed, and is manufactured exclusively by Parmak. 100% American made. Uses the same advanced and exclusive circuitry as the Magnum 12, including Parmak`s exclusive built-in performance meter. Our totally new and improved solar panel uses free energy from the sun to provide maximum shock . . . longer life. No operating costs! Power line convenience with a battery fencer. Twelve-volt battery warranted one year.Additional Features:- Low impedance for maximum power, longer life- Performance meter that shows condition of fence- Ideal for large pastures- 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 – 3.1+ joules*- UL Listed The sun`s energy charges the fencer by day and a sealed 12-volt rechargeable battery powers the fencer at night. Battery included. Low impedance for maximum power, longer life Charges up to 30 miles of fence – 3.1+ joules Weatherproof, portable outdoor model Ideal for large pastures