The Thermacell Patio Shield Mosquito Scent Free Repellent is a fuel-based diffuser designed to create a 15 ft zone of protection against mosquitoes in outdoor settings. This repellent, made of plastic and featuring an EPA registration number of 71910-2, is odorless and provides 12 hours of prevention. With its convenient fuel cartridge power source, this Thermacell unit is a practical and effective solution for outdoor activities where insect repellent is needed. New