The Thermacell Backpacker mosquito repeller effectively repels mosquitoes by creating a 4.5 meter zone of protection. Utilizing the same camping gas canisters (not included) that backpackers and campers 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. Heat produced by the camping gas canister is directed to a small mat infused with the repellent Allethrin, a synthetic version of a naturally occurring repellent found in chrysanthemum flowers. For best results, use on days with light or no wind (bugs are at their worst on these days), and allow 10-15 minutes to form a complete zone of protection around the unit. Dependable performance over 2100 meters of elevation. Usage tips include: 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.