Super powerful charger! This thing is amazing. It's so strong the electricity will jump about a quarter inch or more, it shows all the bad spots on my wire. I'm going to have to replace all of my old wire and some corner insulators that are damaged since I'm getting a lot of jumping sparks. I installed three ground rods too. I was trying to move a shorted wire between zaps and I wasn't fast enough, this thing shocked me with all of it's glory, it literally took my breath away and nearly put me on the ground! Super strong, even stronger than my old 18J charger that shocked me in the neck a few years back. If you don't have a good ground rod system these chargers won't last long. And if you keep running them while they are shorting out I'm sure that will affect the life as well, you need to run them and walk your fence and listen for the sparks / shorts. Properly grounded with good wire and good insulators and this charger should last awhile, I've been through three of them in 20 years here at the farm. Some companies will actually repair them, not sure if this company will or not, but if it fails I'll reach out and see. Of course there is a repair charge and that's usually half of the cost of a new unit. Excellent charger, great price, easy to install too. I also found out that the remote simply silences the alarm, I was hoping it would actually turn off the fence, but that's not the case, I may have to get a remote power shut off separately. Overall a great buy!