Get a great system and install it yourself using the same grade wire the professionals use. Please note that 18 gauge is very heavy duty and some work will have to be done to the ends of the wire to fit into the transmitter. The SportDOG Brand In-Ground Fence System has been proven safe, comfortable, and effective for dogs over 10 pounds. The system works by producing a radio signal from the Fence Transmitter through the Boundary Wire. The Boundary Wire is buried or attached to a fixed object to enclose the dog's Boundary Area. You temporarily define the Boundary Area with Boundary Flags for a visual aid in training your dog. Your dog wears a Collar Receiver with Contact Points that touch his neck and, once trained, is allowed to roam freely in the Boundary Area. When your dog reaches the Warning Zone, the Collar Receiver gives a warning beep. If your dog continues into the Stimulation Zone, a safe stimulation will be delivered through the Contact Points to get his attention until he returns to the Boundary Area. System Includes - Transmitter Collar Receiver 1,000 Feet of Wire 100 Flags Operating Guide with Training Information Charging Adaptor