I'd guess it has some capacitors for storage and delivers a high-voltage, low-amperage jolt. Think Taser or a camera flash.

It does seem silly. I don't know that area at all but would guess they have mountain lion and wild pigs. I understand the second can be pretty nasty, but I can't imagine myself camping surrounded by a fence that I'd inevitably stumble into and zap myself.

Cheers,
_________________________
--Rick