Fi-Shock SS-440 Solar-Powered Low Impedance 10 Acre Medium-Duty Electric Fence Charger 10 acre range under ideal conditions. Resists shorts when the fence is in contact with weeds. Low-impedance technology - less drain on the battery. Intermittent DC output Solar panel features compartmental damage-resistant construction Input Voltage: 4 VDC, .02 A. Output voltage: 8 KV +/- 20% open circuit voltage 2 year limited manufacture warranty