The Thermacell Backpacker Mosquito Repeller effectively repels mosquitoes by creating a 15-foot zone of protection. Utilizing the same camping gas canisters 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. Runs on a backpacking stove fuel canister (not included); fuel efficient- up to 90 hours of run time on a 4 oz canister and up to 360 hours on a 16 oz canister, fuel canister must be pressurized self-sealing (iso) butane and propane fuel mix (product will not function with 100% propane)Lightweight, minimalist compact design. Dependable performance up to an elevation of 7,000 ft.No spray and no mess, Scent and DEET-free. Package contains- 1 Backpacker Repeller, 16 hours of repellent- 4 repellent mats lasting 4 hours each and 1 water-resistant travel bag. *Usage Tips- Do not attempt to use with refilled canisters, Allow gas to flow for 5 seconds before clicking the piezo ignitor, and Only compatible with valves designed to the EN417 specification** Requires camping gas canister (not included).