The Thermacell Patio Shield Mosquito Repeller effectively repels mosquitoes by creating a 15-foot zone of protection. This compact, easy-to-use and stylish device will look great on any patio or deck while it works to keep pesky mosquitoes from biting and bothering your guests. - No spray and no mess. Scent-free and DEET-free. - Same proven Thermacell fuel-powered technology, in a compact and stylish design for patios, decks, and more. - Ideal for use while entertaining. - No open flame, no smoky candles.