SportDOG In-Ground Fence Transmitter

This transmitter can expand up to 100 acres when you purchase additional wire and flag kits. With additional collars you can contain all the pets in your home collars not included. Can be paired with in-ground fence system SDF-100A in-ground fence Add-A-Dog collar SDF-R Contain + Train system SDF-CT Contain + Train Add-A-Dog Collar SDF-CTR. Perfect for all breed sizes. Measures 7.4 x 2.6 x 9.5 inches.