I have two of these Thermacell devices and have never had success. At our old house I blamed it on the windy conditions, but at our new place the air is pretty still on the back patio. This device was CHARGED, and on for one hour, new refill, literally sitting one foot from me. The photo shows the mosquito that landed on my leg and would have bit me had I not killed it with my hand, getting blood on me. So much for protection from West Nile virus. Very disappointed.
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