This is a compact, super tough Energizer that comes with a rechargeable battery and in-built solar panel. The S16 with 0.16 Joules of stored energy, is quick and easy to install and is suitable for short term, portable fencing on small properties up to 30 acres. Simply turn on and forget, the Energizer will continue to work for up to 3 weeks without sun. Quick to install, it can be set up easily in any location and moved about as required. The Energizer comes with a rechargeable battery, solar panel and post mount, as well as fence and earth leads. It is super tough, drop resistant, and features waterproof casing with built-in lightning protection. It is designed to maximize battery life. The pulse rate slows at night, when livestock are less active, to save battery power. It features 360 degree mounting on Steel posts for correct orientation toward the sun, which allows the Energizer to be mounted on a steel post that is already part of the fence line, regardless of which way the post is facing.