EFFECTIVE MOSQUITO PROTECTION: Thermacell Mosquito Repellent Rechargeable E55 creates a 20-foot zone of protection against mosquitoes. Ideal for the backyard, poolside, patio, deck, and more. Easy to use, one button keeps mosquitoes away. HEAT-ACTIVATED TECHNOLOGY: Powered by a rechargeable lithium-ion battery with up to 5.5 hours of continuous mosquito protection per charge. No fuel to monitor and replace. Emits scent-free repellent that drives away mosquitoes. EFFECTIVELY REPEL WITHOUT SPRAY OR SCENT: Repel mosquitoes without DEET sprays or lotions on your skin. No smoke, flames, or harsh odors like citronella. Enjoy max protection in 15 minutes. Unscented, liquid repellent cartridges are easy to replace. ADVANCED REPELLENT: Independently tested and EPA reviewed for safety & effectiveness. Repels tough mosquitoes, including those that may transmit Encephalitis, West Nile Virus, and Zika Virus. People and pet friendly. THERMACELL GUARANTEE: Extend warranty to 3 years with registration (automatic 2-year warranty included). Backed by Thermacell Guarantee. See packaging for details. Includes repeller, 12-hour refill repellent cartridge, and USB charging cable.