We bought this product as we did not need to cover a large area. We have fencing on both sides of the yard and a line of dense bamboo at the rear of the property. In total we needed about 30m.Easy to install, but read the entire directions first and plan the layout. Doing so could save you a lot of heartache.So far it works well. We have an Australian Cattle Dog pup that is high energy and learns quickly. She was trained to stay away from the invisible fence in 3 days. You do have to work with the dog. They are not going to learn to avoid the fence by themselves!