For the backyard and beyond, the Thermacell E-series is easy to use and provides hours of scent free, mess free mosquito defense. The EL55 provides a 20 foot zone of advanced mosquito protection and up to a 9 hour battery life. This portable and compact repeller provides ambient dimmable light to create a warm, comfy space around your patio, deck, pool, and more. Audio cues and LEDs let you know when you're protected and how much battery life remains. Keep mosquitoes away with the simple push of a button.