OK, I tried all the fancy solar vibrator, sonic sound, windmills, you name it, I tried it but my yard still looked like it was plowed by a John Deer. I as a last ditch effort decided to try these from Walmart. I will have to say they are well made arrived fast and the batteries seems to be holding up well. The most important part..They moved the moles from my yard. I waited before writing this review until I saw real results and I have.. My neighbor wasn't as happy though. He has ordered himself a couple and since he is on the wood line we hope to keep them at bay there. Buy good batteries and follow the instructions. I have sandy soil so I had to put mine down with a pilot hole and then tamp the dirt really well around them. The firmer the soil the better it carries the vibration. These have worked well for me I have a large yard. I ordered 4 but have used only two so far and they are holding for now. I will keep the extras for later. I also liked the fact you can put these level with the lawn and then mow right over them, water tight seal hasn't let me down yet...Good investment..