This being the third type of electric killer that I have used since 1997 it is by far the most effective. I put it to use three days ago at the back of my yard & have had to blow the dead insects off with my leaf blower each following morning. I like when it kills an insect; the noise lets me know it's working. We are insect free on the deck about 40' away. Couldn't be better in my book. This is a product to stick with.