The Thermacell Patio Shield Mosquito Repeller Lantern effectively keeps mosquitoes up to 15' away. Thermacell works fast, providing max protection in just 15 minutes. Effective 15' Zone Technology â Engineered to precisely diffuse repellent, creating a 15' zone of mosquito protection. Powered by a safe and compact fuel cartridge. Independent Light Feature â Beautiful, functional light combines with powerful mosquito repellent to make the ideal companion for nighttime recreation. The independent light feature uses 3 AAA batteries (not included).Repel Mosquitoes in Air, Not on your Skin â Repel mosquitoes without DEET sprays or lotions on your skin. Scent-free, no smoke, no flames. Proprietary Formula â Independently tested and EPA reviewed for safety and effectiveness. Repels tough mosquitoes, including those that may transmit Encephalitis, West Nile Virus, and Zika Virus. Includes â One repeller, one 12-hour fuel cartridge, and three 4-hour repellent mats. NOTE: For Outdoor Use OnlySpecsActive Ingredient: 21.97% D Cis AllethrinRefill / Cartridge Type: Mat and Fuel RefillsWeight: 8.0 ouncesDimensions: 4.25" dia. x 6.5"HBatteries Required: 3 AAA (not included) Beautiful, functional light makes it ideal for nighttime recreation Uses 3 AAA batteries (not included) Includes repeller, 12-hour fuel cartridge, & three 4-hour repellent mats