Technically advanced, low impedance design - with over 12.5 joules of shock output power - enables the RM-1 to effectively charge over 100 miles of fence. Features advanced computer-controlled circuitry. Digital performance meter shows voltage on fence, within 100 volts. Highly visible multi-colored LED lights show condition of fence. Audible & visible Shut Down Alarm sounds when fence charger is improperly functioning. Rugged, high impact ABS housing. For indoor installation. 2 yr warranty including lightning damage. 110-20 volt, UL listed. Model RM-1.