Your fence controller lies at the heart of your electric fence. It maintains the voltage on the fence line and determines the severity of the shock an animal receives. It is, therefore, one of the most critical decisions you will make about your electric fence. Specifications: 50 Mile Range 2.8 stored joules; 2 joule output at 200 ohms Heavy, wet weed conditions Ideal for remote locations 12 volt battery Digital timing Fuseless design Fence lamp flashes when operating Vented weather-resistant nonconductive cabinet Moisture-resistant internal components Built to UL safety specifications Use with 126 amp-hour deep-cycle battery Model # B50LI. Battery not included.