... spot, without dead angle, perimeter electric fence may erect along with the terrain fluctuation, it may install on the main entrance ... switch, use it freely, low voltage in day time, high voltage at night.♥ Unique BI-polar technology, makes every strands ... battery, convenient management.♥ Constant open/close, DC12V, RS 485 conjunct function when alarm♥ User can set alarm delayed triggered time freely ...