The Gallagher M550 is a powerful 230V mains-powered electric fence energiser, designed for fences up to 35 km (21 miles) with light vegetation or 10 km (6 miles) with heavy vegetation. It delivers 5.5 Joules of stored energy and 3.7 Joules of output energy, making it ideal for controlling various animals including cattle, horses, and sheep. This robust energiser features a built-in lightning protection and a clear LED indicator for quick status checks. Its durable construction ensures reliable performance in diverse conditions.