The Gallagher 382302 FENCE POWER PLUS M1200 is a powerful mains-powered fence energizer designed for large fence systems up to 48 kilometers (30 miles). It delivers 12 Joules of stored energy and 8 Joules of output energy, making it suitable for controlling various livestock, including cattle, sheep, and horses. This robust energizer features built-in lightning protection and a large, easy-to-read digital display that shows output voltage, earth voltage, and current. Its robust, weather-resistant casing ensures durability in outdoor conditions, providing reliable fence performance.