This all-natural, portable mosquito repellent creates a 15 by 15 foot bug-free zone, letting you enjoy your porch, campsite, or lawn without being bugged. The repellent’s all-natural, DEET-free formula is made from chrysanthemum plants, which are known to keep certain kinds of bugs away. A small butane cartridge heats up the natural repellent soaked mat inside ThermaCELL, activating and spreading it. There’s nothing to plug in and the repellent and butane are refillable.