How Wireless Fences Work
Wireless--or invisible--pet fences are a system of signal-emitting wires buried in the ground to delineate a boundary. When a pet goes near the boundary, a battery-powered collar delivers a warning sound and, if the pet continues to approach, a small electric shock. Through learning, the pet becomes conditioned to remain within the boundary.
The form of radiation with the most potential to harm living organisms is ionizing radiation. Examples of ionizing radiation include radioactive materials and X-ray tubes.
Non-ionizing radiation doesn't harm DNA in the way that ionizing radiation can. Low frequency, low power non-ionizing radiation generally has no effect on biological tissue. Examples of non-ionizing radiation include moonlight, radio signals and light bulbs.
Wireless Pet Fence Radiation
Wireless pet fences use non-ionizing low frequency radio waves at very low power. Based on Occupational Safety and Health Administration guidelines, the low frequency and weak transmission power of wireless fence systems are harmless to humans and animals.
A big-city radio station can broadcast at 50,000 watts.
A typical light bulb uses 75 watts.
A standard walkie-talkie can broadcast five watts.
A typical wireless fence system uses between five and 15 watts spread across several hundred feet of buried wire.