thats why why need the 3 +trip wires so it cant get near enough to dig or jump, a fence with no trip wires is not secure enough..... the mains quote was a joke 250000 volts, jarasic park ;)for bears and cougers, theres no difference on output between battery or mains, they both hurt when you walk into them. I DONT KNOW IF THIS WILL SEEM AS FUNNY WRITTEN DOWN BUT the funniest thing i watched was, i had some plastic poles about 6 feet tall with some solar lights in the top next to my trip wires, a friend came round one day and asked if he could have the solar lights, i said yes so he went to reach for it out of the top of the pole and as he grabbed it his leg touched the trip wire, he starting shaking and shouting as he thought the light was giving him the shock so he let go but didnt move his leg standing there still getting electric belts to his leg, i was falling about laughing it was so funny.