Thermacell Repellents E55X: The Thermacell E-Series 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 repeller provides a 20ft zone of protection against mosquitoes. Scent free, no smoke, no mess. Charge indicator lets you know how much run time is left with each 5.50+ hour charge. Includes one 12-hour refill repellent cartridge and a USB charging cable.