The Agrifence Dual Power Eco Energiser is a 12V battery or mains power energiser. These energisers can extend the life of a battery charge up to as 4 times as much. Equally on mains power, these energisers provide plenty of power for longer, more permanent electric fences. Comes with an earth stake, all connection leads and a mains adaptor. Requires a 12-volt battery if not using mains. Available in 4 different strengths.