Designed for the adventurer, Thermacell Backpacker Mosquito Repeller is easy to use and provides hours of scent-free, mess-free mosquito defense up to 15 feet. With no batteries or cords needed, the Backpacker provides convenient, portable mosquito protection that's dependable up to an elevation of 7,000 feet. Utilizing the same camping gas canisters (not included) that backpackers and campers likely have in their bag already, the compact and lightweight Backpacker Repeller is an essential piece of gear for life's adventures. Lightweight design shaves ounces out of your pack (114g/4.0 oz). Compact size (97mm H x 50mm W x 67mm L). Dependable performance up to an elevation of 7,000 feet. Fuel efficient with up to 90 hours of run time on a 4 oz. canister and up to 360 hours on a 16 oz. canister. Usage Tips: Do not attempt to use with refilled canisters. Allow gas to flow for 5 seconds before clicking the piezo ignitor. Only compatible with valves designed to the EN417 specification. Mosquitoes are no small problem - they can ruin a good time with painful bites, bothersome buzzing, and days of itching afterward. Until now, sprays, lotions, torches, DEET and citronella have been the only options for fighting mosquitoes. We started Thermacell because we wanted a better way to fight mosquitoes. From humble beginnings, our team of entomologists, researchers, and outdoor enthusiasts has over 100 years of combined experience fighting mosquitoes.