The strongest solar energiser on the market. With a 40 Watt solar panel, can power up to 30km of fencing. Even after a week without direct sunlight the S400 retains enough power to put voltage through your fence. Extremely suitable for temporary fencing covering a large area where no socket is located near by. Ensure you register your new fencer at www.gallagher.eu to recieve your 7 year warranty.