Fi-Shock SS-4000X AC Powered Heavy-Duty 20 Miles Electric Fence Charger with Self-Diagnostic Circuitry Heavy duty chargers for electric fence containment of pigs, cattle, horses, deer, cows, sheep and goats Uses two 1 amp fuses for down-line protection against power surges. Output Voltage: 15 KV +/- 20-Percent open circuit Voltage Self-diagnostic; shows if circuit board is operational for easy repair analysis UL listed AC powered fence electric energizer. Indicator lamp lights show strength of electrical charge on fence One Year Limited Warranty