I have this thing in the ground for about a month, and I haven't seen any moles or their mounds during that time. The product is well constructed and easy to get up and running. Being this time of year in the Pacific Northwest, it was hard to get two sunny days to allow the battery to charge up. Two partly cloudy days worked. It's in the ground, and I don't even have to think about it. I occasionally hear the noise it makes every 30 seconds, but it blends in well with its surroundings. I have a large yard, and this thing says its good for 7000 square feet. However, if a second one is necessary, I won't hesitate to buy another one.