I have been in my blind or on open ground sitting against a tree in the morning when the temp started to warm and the Mosquitoes started flying in in full force. I turn it on, and within three or four minutes max they have cleared out.
Fewcomments!
1. Make sure you lay it flat on ground or surface.
2. I like it on ground under my seat so the scent comes upward.
3. Make sure you have the blue pad directly on the metal tray and not elevated like on the scent machine. (The scent Thermacell has the raised tray. The bug thermocell does not.
4. You will see a faint steam rising from it when working properly.
5. If it has lost it's blue color replace it. Cheap enought to replace every other hunt or so.....
Hope this helps. Here is link at Bass Pro THERMOCELL