The Thermacell MR450 Armored Portable Mosquito Repeller effectively repels mosquitoes by creating a 15 ft zone of protection. This small rugged device can be taken virtually anywhere to repel pesky mosquitoes, stopping them before they can bite or bother you. Ideal for repelling mosquitoes from the backyard to the great outdoors, portable and lightweight. No spray and no mess. Scent-free and DEET-free.