The Thermacell Backpacker Repeller creates a 15 ft x 15 ft zone of protection against mosquitoes without messy lotions or sprays. It weighs only 4 ounces yet delivers up to 90 hours of protection using a fuel source you already carry?camping stove gas canisters (90 hours from a 4 oz. canister). You can have an entire evening of mosquito freedom on less gas than it takes to boil a pot of water. Tested and proven in the backcountry. Compact, rugged, and effective. See for yourself why so many outdoor enthusiasts would never head out without their Thermacell Repeller.