E55 provides a 20-foot zone of advanced mosquito protection. Features a 5.5-hour battery - can charge while operating to extend run time. 12 hours of mosquito repellent included. Audio cues and LEDs let you know you're protected and how much battery life remains. Keep mosquitoes away with the simple push of a button. Features: E55 creates a 20-foot zone of protection against mosquitoes - 80% more area than our original line. Easy to use, one button keeps mosquitoes away. Powered by a rechargeable lithium-ion battery with up to 5.5 hours of continuous mosquito protection per charge. Can charge while operating to extend run time. Repel mosquitoes without DEET sprays or lotions on your skin. 12 hours of mosquito repellent included. Unscented, liquid-repellent cartridge is easy to replace. Stay protected even longer with a 40-hour repellent refill (sold separately). 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. Extend warranty to 3 years with registration (automatic 2-year warranty included). See packaging for details. Includes: One 5.5-hour rechargeable repeller with a built-in Li-Ion rechargeable battery, one 12-hour refill repellent cartridge, and a USB charging cable.