The portable battery energizer from Gallagher is best suited to fences at 1 km or shorter, a incredibly light weight product that easily attached to poly wire, poly tape,galvanised wire or tread in post. works on 6 D cell batteries or 12 V battery with adaptor ( Batteries Not Included! ). A handy item to keep too protect your gardens from animals is suitable for outside use and comes with a two year warranty.