The Dare Enforcer Series 100 Acre Fence Energizer DE 400 has the power to control overgrown fences of up to 100 acres! This 1 JOULE OUTPUT fence energizer outperforms 25 mile energizers, making it ideal for keeping your cattle, horses, pigs, and dogs safe and contained. Get your animals under control and enjoy peace of mind with the ultra-effective Dare Enforcer Series!