From the backyard to the cottage, the Thermacell EL55 Glow Light rechargeable mosquito repellent device provides a 20-feet zone of protection from mosquitoes. Powered by a built-in Li-Ion rechargeable battery, this system heats and diffuses scent-free liquid repellent and last up to 9 hours per battery charge. Plus, the audio cues and LEDs let you know the portable device is on and how much battery life remains while the dimmable light provides a warm, cozy space on your patio, deck or around the pool so you can make the most of the outdoors this summer.