Flies, Mosquito's other other bugs gone
They work as in the immediate area you have lots of dead to clean up 12 hours after its been on.
Most bugs that pass end up slowly dying.
They are moderate cost. There are times when I need to put them on for longer than 12 hrs due to infestations, however, I don't suffer from nose and eye irritations like with sprays and most of the plug in or burn type coils.
In a three bedroom home I have one in Kitchen, one in Laundry, one in the bedroom at furthermost end of house and even one on the back veranda.
I have one I take in my Camper horse float when connecting to generator to make any stop comfortable