This product will power up to 3km of fencing at a fence voltage of around 2800v under normal load and has two power output settings. On the low power setting, it has 0.17 output joules and on the high power setting it has 0.34 output joules. This allows you to run it on high power when necessary or until your animals have got used to the fence.FeaturesSupplied with 4 internal D cell 6v batteries slotted in to the energiser housingLeads to connect to a 12v battery and to the fence are included