Lanstar LX-P200 Electric Fence Energizer.

The LX-P200 has a stored energy of 2.7 Joules, which is suitable for medium-sized fences up to 20 miles. Functionality: It's an electric fence controller designed to deter livestock and other animals from crossing the fence line. Package contents: The package includes the energizer, a user manual, and the packaging box. Power source: It's unclear from the image whether this model is solar-powered, battery-powered, or mains-powered.