Lentek PR30 Ultrasonic Pest Repeller (3-Pack) Lawn & Patio

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Spiders are another issue though. We found daddy-long-legs hanging from the unit the first day we installed them. However, they may have been confused!??? After getting rid of those spiders, we have not seen anymore. We are not sure what the long-term effect on spiders is, but we are totally convinced they work on ants.

She installed these Lantek Pest Repellers a week ago and after encountering waterbugs in the spring/summer daily for years she has not seen one in her house since the day she plugged them in. Her home is very small (about 900 sq. feet) and she bought 2 (3 packs) so she was sure to have enough coverage. Although it does not seem to effect the tiny ants from coming in under the kitchen back door (where she has 2 plugged in) she would much rather have ants to deal with than the 2inch Philadelphia waterbugs. Although the neighbors probably aren't to happy right now because all of the critters probably ran to their house. The true test will be the next time we have a drought when the problem is usually the worst. That is when they come into the homes in mass numbers seeking water. But so far so good. I am going to order some myself to see if it helps with the Yellow Sac spiders and the huge numbers of bats that we have in our neighborhood that sometimes get into the homes. I do recommend these, they do work on certain insects but from what I have seen, not ants. The repellers are much smaller than what they appear to be in the photo (about 2x3 inches) which is a plus because we have a 1920 home with baseboard sockets and don't have to worry about them being too large to fit into the receptacle.