The Gallagher 392004 B100 is a robust 1.0 Joule portable electric fence energizer designed for small to medium farm applications. This reliable B100 model can power up to 10 km (6 miles) of multi-wire fence, making it suitable for controlling various livestock. It operates efficiently on a 12V deep cycle battery and can be easily converted to solar power with an appropriate solar panel kit. Featuring a low battery indicator and a durable, weather-resistant case, the B100 ensures consistent performance and easy installation in diverse outdoor conditions. Ideal for rotational grazing and temporary fencing needs.