Gallagher's Live Fence Indicator tells you in a flash-literally-if your electric fence is live. It allows you to check your fencing from a distance as the flashing beacon is visible from up to 3000 feet away during nighttime. It has a low voltage cutoff, meaning that the unit won't flash if the fence is live but the voltage is too low to be effective. The indicator is easy to operate; simply place the earth stake into the ground and clip the unit onto fence wire or tape. | Gallagher Live Fence Indicator