[Highly Precise GPS Dog Collar Fence System] Pethey's electronic dog fence uses a satellite antenna to figure out where your pet is. It is globally compatible, picking up signals from up to 87 satellites. This helps you easily set up an electric fence boundary for your furry friend. You don't have to dig holes to bury transmitters or pay for costly traditional wooden fences. Wireless electronic fence effortlessly creates a joyful park for your dog.