The Thermacell Patio Shield Metal Edition mosquito repellent device is ready for all your outdoor adventures, whether it is for a day hike or backyard barbecue. With no batteries or cords, this people and pet-friendly system is powered by a compact fuel cartridge that can provide up to 12 hours of protection and it diffuses the scent-free repellent to create a protection zone of up to 15 feet thanks to the repellent mats that change colour when it is time to replace them. Plus, the durable metal finish add a sleek look at the campsite, on your patio and deck or by the pool.