A Perimeter Technologies Underground Dog Fence is different than any other brands for two reasons. They are the first to develop WiFi technology for an underground dog fence and are the only ones to use comfort contact with thier containment systems. Comfort Contacts on a Perimeter Technologies Underground Dog Fence cushion the pet's neck with a soft rubber probe. Other brands us hard steel probes with in other systems. Comfort Contacts they help to reduce the incidence of skin irritations that may occur. The WiFi Perimeter Technologies Dog Fence is a systems that is portable can be used anywhere. Set up takes only a matter of minutes. You can bet on being satisfied with the innovation of a Perimeter Technologies Underground Dog Fence.