I use both the "TRAPSTIK" for Folie and the "TRAPSTIK" for Wasps, etc. You can use them in or outdoors. I am more concerned with Wasp, etc. version. I have outside, one on the railing of an open porch the other hanging from the railing of my deck (not covered). With all the rain we have had here in the DC area, they are still in good shape.
I first came upon them in a Southern States store while cruising the aisles. Sometimes a Home Depot or Lowes has the one for flies.
I now order them through Amazon!