This is my second experience using a in-ground electric fence. I got this one to replace my years-old many-times-damaged line.***First - very important*** If you have a very stubborn, prey-driven, or over-zealous dog, this fence alone will not be enough to stop them. Do NOT depend on this fence as a stand-alone containment system. The fence works by shocking the dog when it gets to near or past the line. The shocks increase in intensity when your dog is in the no-go zone. You can increase the shock strength, but once your dog has run though the zap-zone, crossed the boundary and is out of range to be shocked further, the fence is ineffective. Also, the dog must have the collar on to trip the line and the collar must be charged. Regularly inspect your collars and your line.Your dog may be easy to train and stay in the perimeter forever after the first few shocks - or your dog may be like mine and regularly check the fence by entering the warning zone to see if it is active. I know right away when the fence is down because Pooch is in my vegetables. Be aware of the limitations of this system.I use the fence as an deterrent to keep my dog away from the actual wooden fences around my property and out of my garden area and it has worked very well as long as the fence has been active.I suggest several things to avoid trouble later. It's a hassle upfront, but if you run your wire though some kind of tubing before burying it, you can save yourself a lot of time having to troubleshoot and find a break later on. I made the mistake of putting the line directly in the ground when laying my first line. Inevitably the line will break in someplace and then you have to go searching and make a repair since the fence won't work if there is a break in the system.This kit has everything you need, short of the tools and the pet. Since this set comes with 2 collars, you have the flexibility of adding another pet or having a backup collar if the battery in one is dead. You can also purchase collars separately if you have more animals. If your wire will be plugged in outside, I also recommend buying housing to protect the loop/transmitter from the elements.Great fence. I am happy enough with the system that I chose to go with their fence again to replace my old fence.