"I purchased this system a few years ago, and when it works, it works very well! However, it is highly susceptible to lightning storms killing the sending unit, and if you do an above ground installation is is susceptible to rabbits, squirrels, chipmunks, you name it- chewiing the wire in half! That means three or four times a year I have to go trudging through the woods behid my house looking for the broken wire and fixing it. I have had to replace the sending unit at least annually as well."