No, it's a collar with a small battery and it gives a muscle stimulant that they don't like. The battery is too small to give much of a shock, and it lasts for three months. It's entirely about training the dogs to stay away from the fence. The few times they get close the collar makes a sound and gives the unpleasant but harmless discharge. The boundary is a buried wire transmitter and the collar picks it up. It's very finely tuned so I can move the boundary as little as six inches in or out if I want.

Say what you will about a system that delivers a correction--it keeps the dogs in the yard and out of harms' way. Considering the number of strays that pass through the neighborhood (and my pit bull was a stray I rescued last year) and the hardships of a stray life, this isn't a bad system at all. The dogs are basically self-regulating--they know their boundaries and are careful to stay within them. It is a real pleasure to be out in the front yard with them. The times that people have come by walking their dogs (on leashes) my dogs have known they couldn't approach so simply stayed put, lying nearby and watching peacefully. This would not have been the case were they loose or on a leash before the invisible fence was put in.

SRS