At first I was afraid it wasn't working.  Then all of the sudden, I heard pops all over the place.  I learned very quickly not to place it around the house, as the next day, there were bugs all around and in my sunroom.  I bought a six foot Sheppard's Hook, but it ended up being to short when it hang.  So I purchased one that screwed in and hung it up on the very top post of my fence.  It worked perfectly!  I can barely hear it when I sit on the patio on the other side of the yard, and I was able to bury the extension cord under my garden rocks and hide it along the fence post.  It could, of course be better and easier if it were battery powered, however I'm sure it wouldn't last longer.  The last time I used it, there were tons of bugs surrounding the fence post, so it is definitely doing it's job in attracting the bugs and moving them away from the porch.