I put this unit in about a month ago. It has worked perfectly for my dog. We live on a country road on a small farm. I wanted to run an invisible fence along the road side allowing my new dog to run freely behind it, but stay safe from the traffic. It works great. Just ran a narrow loop along road back to the transmitter. It was a pretty long distance requiring an extra spool of wire to complete. This unit energized the circuit just fine. I considered a wireless unit, but felt underground fence worked better for my needs.