3X Lot Each comes with 12 hour cartridge and 3 repellent mats. The Thermacell Mosquito Repellent Patio Shield in Riverbed scent is a dispenser designed to create a 15ft zone of protection against mosquitoes outdoors. Made of plastic and metal, this Shield Mosquito Repeller is odorless and provides up to 12 hours of prevention. With an EPA registration number of 71910-2, this pack includes 3 units, each weighing 0.6 lbs. The Thermacell brand ensures quality and effectiveness in repelling mosquitoes from your outdoor spaces.