I sent away for a product in a mail order book that you plug in it is sonic.........keeping the flies out, the spiders out..bees out...........waiting for fall to see about chipmonks & mice and squirrels....it works off the house wiring...so far nothing on the enclosed porch.....no wasps nests...........lavendar won't winter for us in NE PA.........I have 2 in the house and 1 for the barn & storage....so far I have not seen anything.....but fall is coming fast...........does not bother the cats or dogs. A red light flashes and once in a great while I will hear a tiny beep. Several other neighbors are using the same type unit.