MOSQUITO PROTECTION THAT WORKS: Thermacell effectively keeps mosquitoes up to 20FT away. Works fast, get max protection in 15 minutes. Easy to use. Portable device is ideal for backyard, poolside, patio, and beyond. Allowed to bring on airplanes. EFFECTIVE 20FT ZONE TECHNOLOGY: Engineered to precisely diffuse repellent, creating a 20-foot zone of mosquito protection. Consistent repellent protection won’t weaken over time. Rechargeable lithium-ion battery works for 9 hours. REPEL MOSQUITOES IN AIR, NOT ON YOUR SKIN: Repel mosquitoes without DEET sprays or lotions on your skin. Long lasting repellent cartridges are easy to replace. Scent-free, no smoke, no flames. PROPRIETARY FORMULA: Independently tested and EPA reviewed for safety & effectiveness. Repels biting mosquitoes, including those that may transmit Encephalitis, West Nile Virus, and Zika Virus. People and pet friendly. 100% SATISFACTION GUARANTEED: Extend warranty to 3 years with registration (automatic 2-year warranty included). Backed by Thermacell Guarantee (see packaging for details).