Keep mosquitoes away with the simple push of a button thanks to the Thermacell E55 rechargeable mosquito repellent device. Powered by a built-in Li-Ion rechargeable battery, this system heats and diffuses scent-free liquid repellent to create a zone of protection from mosquitoes that lasts up to 5.5 hours per battery charge. Plus, the audio cues and LEDs let you know the portable device is on so you can sit back and relax on your patio, your deck or at the cottage.