Introducing from Thermacell the Halo Mini Patio Mosquito Repeller, this sophisticated looking mosquito and midge repeller provides a 20m2 insect free zone. The Halo Mini is clean and simple to use, comes with 3 repellent mats and one butane cartridge. The butane cartridge can easily be replaced once empty, and a new one installed. The cartridge itself can last up to 12 hours and screws into and inside the Halo, no need to carry a gas hose and makes this mosquito and midge repeller cordless. The repellent mat, slots in the top of the unit and on the metal grill. Simply turn on the device and push start. No exposed flame, the internal combustion will heat the repellent mat, this heat will transfer onto the grill and through the heat and air will disperse a scent-free repellent. The allethrin repellent, is a synthetic copy of a natural repellent found in chrysanthemum plants. Each mat lasts a maximum of 4 hours.