Gallagher's M1100 Energizer is crafted from a rugged combination of tough, high impact plastic. Clean Fence: 110 miles / 650 acres - Typical Fence: 36 miles / 280 acres 11 Joules of stored energy Adaptive voltage control technology increases voltage output when fence conditions change Split bolt terminals for easy installation and good connection Shows output voltage of the energizer at a glance via bar graph Compliance with latest UL Standards guarantees safety and reliability Simple "plug and play" installation.