OFF has a new little clip-on fan dispersed unit that uses similar repellent to Thermacell but doesn't need heat to vaporize. It uses 2AA cells to drive the fan. Very quiet and seems as affective as a Thermacell. It uses replaceable elements that include a replacement indicator. I have about 8 hours on one so far and batteries and element are still going strong. YMMV (Your Mosquitoes May Vary ;-)