DogWatch Hidden Fence System is the #1 recommended system by Vets and the Humane Societies across the country. DogWatch is the only FM digital signal system on the market and with the collars having a 2-year battery life it is plain to see why DogWatch is the best choice for reliable and safe pet containment. Call today for a FREE in-yard estimate (770)-998-2499 and remember to say you heard about DogWatch on WikiFido!