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. Full 2 year warranty covers damage caused by lightning. Twelve-volt battery warranted one year.