Designed for the adventurer, the Thermacell Backpacker Mosquito Repeller is easy to use and provides hours of scent-free, mess-free mosquito defense up to 15-ft (4,5-m). With no batteries or cords needed, it utilizes the same camping gas canisters (not included) that backpackers and campers commonly have in their bag already. It has a lightweight design (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 ft (2,133 m). 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.