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, the E-Series is incredibly effective and is environmentally friendly. Its effectiveness is unmatched by candles or torches.