The DogWatch pet containment system is not an electric dog fence! The buried wire is not electrified. DogWatch and other “invisible” underground pet fence systems are a form of electronic dog fence which use a radio signal. The dog wears a special collar that detects the radio signal. Hidden and invisible pet fences should not be mistakenly referred to as ‘electric fences’ or ‘electric dog fences’. They are radio fences, not electric fences. DogWatch Hidden Fence technology stands out from all the other dog fence brands. DogWatch is the ONLY hidden fence that uses an FM frequency; all other hidden dog fences operate on an AM signal. Our patented SafeLink® Digital FM signal helps protect your pet from unintentional corrections that can happen on the AM frequency (such as from garage door openers, televisions, baby monitors, etc.). FM is a safer, more secure signal, and you will only find it at DogWatch.