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, it utilizes the same camping gas canisters (not included) that backpackers and campers likely have in their bag already. It has a lightweight design (114g/4.0 oz) and compact size (97mm H x 50mm W x 67mm L) and provides 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. Only compatible with valves designed to the EN417 specification. Product Features Thermacell Mosquito Repellent Backpacker creates a 15-foot zone of protection against mosquitoes. Ideal for backpackers, campers, hunters, and other outdoors people. Weighs only 4 ounces. Powered by a camping fuel canister (not included). Emits scent-free repellent that drives away mosquitoes. Repel mosquitoes without DEET sprays or lotions on your skin. 16 hours of mosquito repellent included. Unscented repellent mats last up to 4 hours each and change color when time to replace. Enjoy 360 hours of runtime on a 16 oz fuel canister (not included). The synthetic allethrin formula is inspired by repellent extracts found in plants. Independently tested and EPA reviewed for safety & effectiveness. People and pet friendly. Extend warranty to 2 years with registration (automatic 1-year warranty included). See packaging for details. Lightweight design shaves ounces out of your pack. 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. Includes: One repeller, four 4-hour repellent mats, and one water-resistant travel bag. Requires camping gas canister (not included). 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. *For Outdoor Use Only Product Specifications Active Ingredient 21.97% D Cis Allethrin Refill / Cartridge Type Mat and Fuel Refills Weight 4.0 ounces Length 2 inches Width 2.5 inches Width 4 inches Battery Life N/A