We purchased this to train a 5-yr old adopted dog not to run away from our house. We have a very large property and while he always came back I was always worried that he would reach the road or get hurt. The first couple of times, near the house in a more open area, the collar worked fine. Pod stopped when shocked ( I would recommend starting at low settings and work your way up) and came right back. In hiking though our woods he took off after some deer. Once he was on the other side of the thicket, the collar had no effect, even though he was less than 50 feet away. Works great in winter when there are no leaves to get in the way.

Pros: Works great, fast charging, easy on and off

Cons: Once the dog hits the trees, it doesn't work as well