The Invisible Dog Fence KD661C is the safest, simplest form of pet containment ever. The instant fence operates with the same principles as an underground fence, and yet it is completely wireless. Invisible Dog Fence
Wide range of control — up to 5000 square meters (with additional wire), equivalent to the size of a football field, and variable range, extremely flexible. Five progressive levels of correction allow you to administer training quickly but gently.