The pet fence difference you can feel for yourself! It €™s one thing to make a product that keeps your pet safely in the yard, it €™s another to thoughtfully design a fence with features that make it safer and more comfortable too. Perimeter €™s exclusive Comfort Contacts cushion your pet €™s neck with soft rubber, unlike the hard steel probes used in other pet fences. Veterinarians prefer the softness of the Comfort Contacts to help reduce the incidence of skin irritations. nChances are you heard about pet fencing from a friend or neighbor. Why worry about buying a fence on the same frequency as your neighbor. The Perimeter Ultra Comfort Contact fencing you gives you the flexibility of changing the frequency. nWith the Perimeter Ultra Comfort Contact fence not only do you have the ability to change frequencies you also have the ability to change stimulation settings to achieve a custom range of correction options to fit your dog's specific temperament. In fact, each dog's collar can be programmed to provide only the necessary correction level to be effective. nPerimeter €™s exclusive Comfort Contacts cushion your pet €™s neck with soft rubber, providing a lighter touch solution to hard steel contacts. Veterinarians prefer the softness of the Comfort Contacts to help avoid serious skin irritations. n TEMP CHECK keeps the fence field stable and in the same location when outside temperatures change. Otherwise your fence boundary would move up to 100% when the temperature fluctuates between 30F and 90F degrees. Boundaries that randomly and unexpectedly move are frustrating and dangerous for your pet. n WIRE CHECK automatically compensates for wire problems and adjusts the amount of signal power to ensure the fence boundary remains in a constant location no system can continue to function if the boundary wire has been completely cut . n 12X BATTERY CHECK monitors the status of the training collar battery every two hours, eliminating false low battery indications saving you both time and money. nWiseWire 20 AWG PE20 is a heavy duty, extra high-strength, copper-clad steel wire. A custom grade steel core, metallurgically bonded with a copper cladding, that is uniform and continuous, creating a bi-metal conductor that acts as one and is corrosion resistant. Special annealing and drawing processes are performed during the cladding process to achieve desired engineered benefits of unmatched strength, reliability and durability. nInsulation is a 20 mil, high-density, high molecular weight polyethylene HMWPE/HDPE . WiseWire insulation is engineered to provide superior water blocking and abrasion properties against underground elements and helps prevent accidental breaks caused by rocks in shifting soil conditions, dig-ins, and corrosion. nSystem Includes One advanced wall mount transmitter, One waterproof collar receiver, Comfort Contact Probes, Additional Rubber Comfort Contact tips, Long Hair Steel Contact Probes, and Non-correction long and short training...