The Shrike energiser from Hotline is a medium powered energiser with an output power of 0.33j, suitable for powering short length fences. This Energiser is power from internal 3v batteries or can be run from an external 12v wet battery.There is a low battery / pulse indicator so you can easily tell if the energiser is getting enough power to suit your fencing. The Shrike Energiser has an output power rating of 0.33j and will power up to 18km of fencing.