Gallagher Mains Energizers (M120)Easy to install and service with a compact modular design Designed specifically for small farms and paddocks Suitable for areas up to 10 acres 1. 2 Joules of stored energy Reliable and best suited for fencing small animals and pets Gallagher Mains Fence Master M120 is suitable for small fences and paddocks. There is 1. 2 Joules of stored energy and this energiser is suitable for fencing domestic animals and pets on properties up to 10 acres. The