The E55 offers an impressive 20 feet zone of advanced mosquito protection, ensuring you stay bite-free during outdoor activities. With a 5.5 hr battery that can charge while operating to extend runtime, this device is built for convenience and long-lasting protection. Included with the E55 is 12 hr of mosquito repellent, so you're set for hours of effective defense. Audio cues and LED indicators let you know when you're protected and keep you informed about battery life. Simply push a button and you're ready to keep mosquitoes at bay for a more enjoyable experience outdoors.