Thermacell mosquito protection is a portable product that keeps mosquitoes away and eliminates them in a space as large as 21 m² (4.5-meter radius). Perfect for patios and decks, it is more effective than repellent candles and, unlike the latter, is odourless and won't leave any wax that could spill and damage your table. The product is completely soundless, requires no spraying and can be used wherever mosquitoes are a nuisance. This refill kit comes with 12 insect repellent mats and 4 butane cartridges. Each mat can last up to 4 hours, while each cartridge can last up to 12 hours.