Our most advanced repellent system ever, the Thermacell Rechargeable Mosquito Repellent keeps mosquitoes away, without spray. Within minutes, the system heats and activates our scent-free, invisible repellent, protecting outdoor spaces from mosquitoes. The E-Series been evaluated by the EPA for safety and effectiveness and provides a 20-foot Zone of Protection against mosquitoes - our biggest zone size ever by 80%. Rechargeable and long-lasting. Intelligent, Advanced Technology. Rechargeable and intuitive. One button controls the E-Series. Scent-Free, No-Smoke, No Mess. Long Lasting Refills keep you protected - A single long-lasting refill cartridge (up to 40 hours available) can last the entire season (12 hours included). Charge Indicator Lets you know how much run time is left. 5.5+ hours per charge. Contains: 1 Rechargeable repeller with a built-in Li-Ion rechargeable battery, one 12-hour refill repellent cartridge, and a USB charging cable.