One collar is more sensitive than the other and both tend to go off even when system is turned off. I have not yet found a happy medium distance setting that will allow me to use both collars. Anytime the collars come near a power source they start beeping and shocking. Not very assuring that they will only work when needed while on the dogs.
This hidden pet dog fencing system is among the most reliable, cost-efficient pet containment systems available today. A buried wire transmits a harmless radio signal. When you dog approach the boundary, the signal causes the dogs collar receiver to deliver a warning beep first. If your dog continues closer to the boundary, the system will issue a mild shock. If your dog continues further, the system will issue stronger shocks until your dog returns to within the boundary your have set up. Your dog will naturally seek to avoid correction, and is content staying within established boundaries.