The Dare Eclipse Fence Energizer 12 Volt / 40 Acre DS 40 (SOLAR) is a self-contained, solar-powered unit ideal for remote locations, providing reliable, ultra low-impedance output for single-wire clean fences. Capable of controlling up to 40 acres, it delivers strong performance that surpasses comparable 10-mile solar energizers, making it perfect for managing cattle, horses, pigs, dogs, and garden animals with convenience and efficiency.