The Thermacell Backpacker Mosquito Repeller effectively repels mosquitoes by creating a 15 feet zone of protection. 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. It's also ideal for use while fishing, gardening, hunting, around the backyard, and more. Features: Runs on a backpacking stove fuel canister (not included) Fuel efficient - up to 90 hr of run time on a 4 oz canister Fuel canister must be pressurized self-sealing (iOS) butane and propane fuel mix (product will not function with 100% propane) Lightweight, minimalist design that shaves ounces and inches out of your pack (114 g/4 oz), compact and portable (97 mm H x 50 mm W x 67 mm L) Dependable performance up to an elevation of 7000 feet No spray and no mess, scent-free and deet-free Usage tips - do not attempt to use with refilled canisters, allow gas to flow for 5 sec before clicking the piezo ignitor, and Only compatible with valves designed to the EN417 specification Package contains - (1) backpacker repeller, 16 hr of repellent - (4) repellent mats lasting 4 hr each, and (1) water-resistant travel bag, requires camping gas canister (not included)