A medium powered electric fence unit with intergrated 12 volt battery charged. Also comes with battery charger to keep battery topped up during winter months if necessary. Available in 3 models with different outputs.
 
Powers up to 2.5km - Output 0.33 joules
 
Please note that from April to October the unit will produce adequate power. During December, January and February they would probably need topping up on the mains.