Purchased to replace a used one that I had that stopped working after a season. I have it outside the door that we go in our out of a lot in hopes to have the mosquitoes and such be attracted to it instead of the lights and hence the inside my house. It works pretty well at doing this, though not 100% of them stop entering my house. Does a very good job at attracting them and zapping them. I haven't added any of the mosquito attraction chemical to replace the stuff that came with it- does not seem to be less effective. I recommend it.